[Dongchun Weekly] May Week 3 — KOSPI Touches First-Ever 8,000 Then Crashes -6.12% on KRW 5.56T Foreign Sell

Hey, Dongchun here.

Here's how the week went.

DONGCHUN'S TAKE

The single most important fact this week is that the KOSPI touched its first-ever 8,046.78 intraday print and crashed -6.12% in the same Friday session, triggering the year's 16th sell-side sidecar. The underlying driver was a seventh consecutive day of foreign net selling that pushed May cumulative outflows past KRW 20 trillion as USD/KRW spiked toward the 1,500 line. Watch Nvidia's May 20 earnings and whether USD/KRW finally breaks 1,500 — those two signals decide whether KOSPI 7,500 holds as support or flips to resistance.

The Week in Numbers

The week was mixed in the US and a single-country crisis in Korea. The S&P 500 and Nasdaq both set fresh record highs Wednesday and Thursday before giving everything back Friday on the empty-handed Trump-Xi summit and a 10-year yield spike to 4.60%, leaving the S&P at +0.13% and the Nasdaq at -0.09% weekly.

US breadth was poor. The Russell 2000 fell -2.37% as small caps absorbed the rate-channel hit, while the Dow slipped -0.17%. The narrow-tape signal warns against extrapolating Thursday's records into sustained momentum.

Korea decoupled in both directions. The KOSPI closed essentially flat (-0.06%) for the week but with a sub-500-point intraday swing on Friday — including the first-ever 8,000 touch — and the KOSDAQ fell -6.45%. EWY tracked Korean weakness as USD/KRW jumped +2.55% to 1,497.76 and foreigners net sold KRW 5.56T in a single Friday session.

The macro variable that mattered most was the 10-year Treasury yield jumping +0.23 percentage points to 4.60%, a one-year high, on the back of CPI +3.8% YoY and PPI +6% YoY shocks. The setup into next week is for continued rate-sensitive pressure unless Nvidia's May 20 print reignites AI momentum.

Index	Week Open	Week Close	Weekly %	Note
S&P 500	7,398.78	7,408.50	+0.13%	Thursday record at 7,501.24
Nasdaq	26,247.88	26,225.14	-0.09%	Thursday record at 26,635.22
Dow Jones	49,610.05	49,526.17	-0.17%	Thursday reclaim of 50,000
Russell 2000	2,861.20	2,793.30	-2.37%	Rate-sensitive sell-off
KOSPI	7,498.00	7,493.18	-0.06%	Friday touched 8,046.78, then -6.12%
KOSDAQ	1,207.72	1,129.82	-6.45%	Friday -5.14% drag

Indicator	Start of Week	End of Week	Weekly Change	Market Read
US 10Y Yield	4.37%	4.60%	+0.23%p	One-year high on CPI/PPI shocks
DXY	97.83	99.27	+1.47%	Hawkish repricing, dollar bid
VIX (weekly high)	17.99	18.77 (Tue)	Below 20	Hedge demand rebuilding, not panic
EWY	-	-	-	Tracking KOSPI weakness, USD/KRW +2.55%

3 Big Themes of the Week

Theme 1: KOSPI First-Ever 8,000 Touch and -6.12% Same-Day Crash

On May 15, KOSPI spiked to a fresh intraday record of 8,046.78 in the morning before collapsing 553 points to close at 7,493.18 (-6.12%), triggering the year's 16th sell-side sidecar at 1:28 p.m. Foreigners dumped KRW 5.56 trillion on a seventh straight session of selling, with May cumulative outflows past KRW 20 trillion concentrated in Samsung Electronics and SK Hynix. The signal carries into next week: USD/KRW at 1,497.76 sitting one tick from 1,500 will likely dictate whether foreign selling extends to an eighth session.

Theme 2: US April CPI +3.8% and PPI +6% Push 10-Year Yield to 4.60%

The April CPI print (+3.8% YoY) on May 12 and April PPI print (+6% YoY, +1.4% MoM) on May 13 came in well above consensus, sending the US 10-year yield from 4.37% to 4.60% — a one-year high — and the 30-year above 5.13%, the first 5%-plus auction since 2007. BofA and Goldman Sachs pulled all 2026 rate-cut calls from their forecasts. For Korea, the channel was FX rather than bonds: hawkish repricing fueled DXY +1.47% and USD/KRW +2.55%, providing the direct trigger for foreign exit.

Theme 3: Cisco's AI Order Guidance $5B→$9B Lifts S&P, Nasdaq to Records

Cisco's May 13 Q1 print beat on both EPS ($1.06 vs $1.04) and revenue ($15.84B vs $15.56B), but the headline was its AI infrastructure and hyperscaler order guidance raise from $5 billion to $9 billion. The stock jumped +15~17% and spread the AI-capex thesis across software and semis, lifting S&P 500 to 7,501.24 and Nasdaq to 26,635.22 on Thursday — both fresh records. The follow-through into next week hinges on Nvidia's May 20 earnings confirming the same data center demand story.

Weekend Catch-up

Trump-Xi summit ended empty-handed: The May 15 summit produced only a 200-plane Boeing order, well below the pre-summit 500-plane figure floated by aides and even below the 2017 deal of 300 planes. Markets read this as zero substance on trade, and the geopolitical premium drove Brent oil up +3.33% to $109.24 on the same day. Monday's US and Korea opens face gap-down risk with futures pointing to -1.3% to -1.7% lows.

Brent crude above $109: Trump's continued hawkish Iran rhetoric kept the geopolitical risk premium intact, sending Brent to $109.24 (+3.33%) and WTI to $101.16. Korean refiners (SK Innovation 096770, S-Oil 010950) face an immediate bid; airlines, shipping and materials face cost pressure. Inflation expectations may re-pressure US Treasuries early next week.

30-year Treasury at 5.13%, first 5%-plus auction since 2007: Long-bond demand is weakening into the new Powell-to-Warsh transition. Duration-sensitive Korean sectors (internet — NAVER 035420, Kakao 035720) face renewed multiple compression risk. Watch whether the 10-year breaks decisively above 4.65% on Monday — if so, risk-asset beta could continue to compress.

Synchronized safe-haven sell-off Friday: Gold -2.88%, silver -10.15% and copper -4.23% all fell together — a liquidity-compression signal rather than a clean safe-haven rotation. Tracks crypto weakness too. Monday's first-30-minute behavior in gold and copper will signal whether risk-asset deleveraging extends or stabilizes.

Sector & Foreign Flow

The strongest US sector this week was semiconductors mid-week, driven by Cisco's AI infrastructure order guidance raise on May 13 lifting SOX above 12,073 on Thursday. The translation to Korea was sharp: SK Hynix (000660) and Samsung Electronics (005930) staged two double-digit-percent gain sessions earlier in the week. Friday's SOX -4.02% wiped out most of that strength.

The weakest US sector this week was small caps and rate-sensitive cyclicals. Russell 2000 fell -2.37% as the 10-year yield spike compressed financial conditions. Korea-linked underperformers were LG Energy Solution (373220) on a Q1 EPS miss of -198.7%, and platform names NAVER (035420) and Kakao (035720), which gave back Thursday's gains on Friday's risk-off.

Foreign investor flow in Korea was historic in scale — KRW 5.56 trillion sold on Friday alone, with May cumulative outflows past KRW 20 trillion concentrated in Samsung Electronics (KRW 5.5T) and SK Hynix (KRW 6.4T). Foreign capital rotated into next-generation themes like Doosan Robotics (+19.85% Friday). The Korean sector with most follow-through potential next week is refining if Brent stays above $105, with SK Innovation's Q1 KRW 2.16T operating profit beat providing a fundamental anchor.

Sector	US Weekly	Direction	Korea Linked	Korea Weekly	Watch Stock
Semiconductors	Mixed	▼	Samsung (005930), SK Hynix (000660)	Weak	Samsung 270,500 KRW (Fri -8.61%)
Big Tech / AI	Nasdaq -0.09%	▬	NAVER (035420), Kakao (035720)	Mixed	NAVER 203,500 KRW (Fri -4.46%)
Energy	Brent +6%	▲	S-Oil (010950), SK Innovation (096770)	Strong	SK Innovation Q1 OP KRW 2.16T beat
Financials	Dow -0.17%	▼	KB (105560), Shinhan (055550)	Weak	KOSPI financials -2.47% Friday
EV / Battery	Weak	▼	LG Energy (373220), Samsung SDI (006400)	Weak	LG Energy Q1 EPS -198.7% miss

Crypto Corner & Kimchi Premium

Bitcoin spent the week range-bound between $80,000 and $82,000 as the CPI/PPI shock and Fed transition uncertainty dominated. The biggest single-day move was Friday's pullback to $80,832 on liquidity compression across all risk assets. Bitcoin closed roughly -1.4% on the week.

Ethereum underperformed Bitcoin, falling about -2.2% to $2,250 with a -2.1% Friday drop. Solana spent most of the week as a relative leader, touching +12% gains intra-week before giving back -5.6% on Friday to close near $90. ETH/BTC ratio compressed further.

Kimchi Premium stood near 0.77% as of 2026-05-16 KST, well below the 1.98% peak on May 7 (the highest since late February). The narrow premium signals weak Korean retail demand for crypto, partly reflecting Bithumb's six-month operational suspension that reduced exchange competition. A reading below 1% historically aligns with neutral local sentiment.

Fear & Greed Index printed 43 — Fear zone, retreating from the 50 (Neutral) print on May 6 that ended a 108-day run of fear readings. Total crypto market cap was approximately $2.69 trillion (-2.61% week-on-week) with BTC dominance at 58.3%. Next week's signal is whether BTC reclaims $82K on Nvidia momentum — if not, the safe-haven and risk-asset synchronized sell-off pattern from Friday could extend.

Coin	Week Open	Week Close	Weekly %	Key Driver
BTC	~$82,000	$80,832	-1.4%	CPI/PPI shock, Fed transition
ETH	~$2,300	$2,250	-2.2%	Friday -2.1% extension
SOL	~$95	$90	-5.3%	Intra-week +12% peak, Friday -5.6%

Kimchi Premium: 0.77% as of 2026-05-16 KST Fear & Greed: 43 — Fear

This Week's Prediction Scorecard

Honest verdict: prediction quality cratered after Wednesday. The first half of the week (Mon PM to Wed AM) had decent box-range hits, but the latter half failed to anticipate either the +1.75% Thursday breakout or the -6.12% Friday crash. Roughly 2 out of 8 predictions landed cleanly.

The single best prediction was Wednesday's PM call of a 7,800–7,900 box with 8,000 in play if foreign selling moderated. Thursday delivered 7,981.41 (+1.75%), almost exactly at the box top, and the 8,000 trigger condition was effectively met. The driver — retail buying offsetting foreign selling on a thin breadth tape — was correctly identified.

The biggest miss was Thursday PM forecasting a 7,900–8,000 range into Friday. The actual result was a record print at 8,046.78 followed by a -6.12% collapse to 7,493.18 — a 553-point intraday swing the box-range framework completely missed. Lesson for next week: when FX moves more than +1% in a session and foreign selling is already at a streak, ignore box-range comfort and prioritize the FX-and-flow tape.

Day	Post	Key Prediction	Actual Result	Verdict
Mon	PM	KOSPI 7,900 retest / 7,700 support	7,643.15 -2.29%, both boxes missed	❌
Tue	AM	7,450–7,520 box	7,643.15 -2.29% deep retracement	❌
Tue	PM	7,600–7,700 box, 7,500 support	7,844.01 +2.63% box-top break	❌
Wed	AM	7,750–7,850 box	7,844.01 +2.63% landed	✅
Wed	PM	7,800–7,900 box, 8,000 trigger	7,981.41 +1.75% near 8,000	✅
Thu	AM	7,600–7,700 box	7,981.41 +1.75% record high	❌
Thu	PM	7,900–8,000 range	7,493.18 -6.12% crash	❌
Fri	AM	Gap up holds, record-high zone	8,046.78 touch then -6.12%	△

Next Week's Playbook

The single most important variable to watch next week is USD/KRW at 1,500. The pair sits at 1,497.76 after a +2.55% weekly move, and a decisive break above 1,500 would extend foreign selling into an eighth consecutive session and likely test 7,300 KOSPI support. A retracement below 1,490 is the only condition that meaningfully changes the foreign-outflow tape.

US market direction is Cautious next week. The Trump-Xi summit disappointment, 10-year yield at 4.60%, and Friday's synchronized risk-off across stocks, gold, copper and bitcoin point to a defensive setup until Nvidia's May 20 earnings clarify the AI-capex narrative. KOSPI directional call is Cautious-to-Bearish with 7,500 as critical support; bear condition is USD/KRW breaks 1,500 and foreign sell extends, bull condition is foreign selling pauses and Samsung Electronics flow turns positive in the 9:00–9:05 AM KST open window.

The single best leading indicator for Korea's Monday open is foreign net buy/sell on Samsung Electronics (005930) in the first 30 minutes after 9:00 AM KST. An underappreciated risk is that the 30-year Treasury at 5.13% signals waning long-bond demand, which could pressure duration-sensitive Korean internet names beyond what current consensus expects. An underappreciated opportunity is Korean refining — SK Innovation (096770) and S-Oil (010950) — with Brent at $109 and SK Holdings reporting May 21.

Date	Event	Consensus / Expected	Market Impact
2026-05-19 (Tue)	US April Retail Sales	Consensus check needed	Consumer-strength gauge, hawkish-pricing trigger
2026-05-20 (Wed)	NVIDIA Q1 Earnings (after close)	AI data-center demand confirmation	SOX, Samsung Electronics, SK Hynix trend setter
2026-05-21 (Thu)	SK Holdings Q1 (Korea)	EPS KRW 11,019, Rev KRW 31.63T	Refining/energy sector re-rating variable
Throughout week	Walmart, Home Depot, Target earnings	Post-PPI consumer-spending read	Cyclicals directional swing

DONGCHUN'S WRAP

A week that printed the first-ever 8,000 and a -6.12% crash on the same day — that's not a market, that's a roller coaster with no seatbelts, and the only handle left to grab is the 1,500 won line.

So — what shape is next week taking?

That's the weekly wrap for 2026-05-17. Trade safe.

Search This Blog

Dongchun's Daily Market Digest