KOSPI's Worst Quarter Since 2020: EWYUSDT Down 2.25% This Week
KOSPI posted its worst quarter since 2020, and Binance Korea-linked contracts moved with it.
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A 2.25% weekly drop, but the real story sits on September 28
KOSPI's worst quarter since 2020 left a clear mark on Binance's Korea-linked contracts. EWYUSDT moved from 187.76 USDT to 183.54 USDT, a 2.25% weekly decline; KORUUSDT fell 6.34%; SAMSUNGUSDT fell 6.52%; SKHYNIXUSDT fell 2.32%. All four moved the same direction, but the spread between them is more than double, which means the pressure was not evenly spread. What matters for anyone trading these contracts is not the quarterly headline but which single day produced the drop and where price gapped from.
How the week actually unfolded
Daily candles for all four symbols, from the Binance public API.
| Date | EWYUSDT O/C | EWYUSDT Chg | KORUUSDT O/C | KORUUSDT Chg | SAMSUNGUSDT O/C | SAMSUNGUSDT Chg | SKHYNIXUSDT O/C | SKHYNIXUSDT Chg |
|---|---|---|---|---|---|---|---|---|
| 2026-09-23 | 192.93 / 186.19 | -3.49% | 23.86 / 21.42 | -10.23% | 209.83 / 203.51 | -3.01% | 1407.24 / 1341.1 | -4.7% |
| 2026-09-24 | 186.19 / 183.17 | -1.62% | 21.41 / 20.33 | -5.04% | 203.52 / 199.5 | -1.98% | 1341.1 / 1324.8 | -1.22% |
| 2026-09-25 | 183.16 / 187.2 | 2.21% | 20.32 / 21.53 | 5.95% | 199.5 / 205.97 | 3.24% | 1324.79 / 1358.04 | 2.51% |
| 2026-09-26 | 187.2 / 187.38 | 0.1% | 21.54 / 21.55 | 0.05% | 205.96 / 208.47 | 1.22% | 1358.05 / 1364.5 | 0.47% |
| 2026-09-27 | 187.38 / 187.76 | 0.2% | 21.54 / 21.61 | 0.32% | 208.48 / 208.74 | 0.12% | 1364.45 / 1346.16 | -1.34% |
| 2026-09-28 | 187.76 / 183.96 | -2.02% | 21.61 / 20.44 | -5.41% | 208.76 / 196.15 | -6.04% | 1346.28 / 1294.35 | -3.86% |
| 2026-09-29 | 183.96 / 187.28 | 1.8% | 20.45 / 21.5 | 5.13% | 196.16 / 203.27 | 3.62% | 1294.36 / 1323.46 | 2.25% |
| 2026-09-30 | 187.28 / 183.54 | -2% | 21.51 / 20.24 | -5.9% | 203.27 / 195.14 | -4% | 1323.56 / 1315 | -0.65% |
Three days carry the story. On September 23, KORUUSDT dropped from 23.86 USDT to 21.42 USDT, a 10.23% single-day decline and the heaviest candle of the four; SKHYNIXUSDT fell 4.7% and EWYUSDT fell 3.49% the same day. On September 28, SAMSUNGUSDT went from 208.76 USDT to 196.15 USDT, a 6.04% single-day drop, while KORUUSDT fell 5.41%, both opening the weekly loss in one session. On September 30, KORUUSDT fell another 5.9%, SAMSUNGUSDT fell 4%, and EWYUSDT fell 2% to close at 183.54 USDT. Between September 25 and September 27 there were three up days, with KORUUSDT gaining 5.95% on September 25 and SAMSUNGUSDT gaining 3.24%, but the bounce never filled the September 23 gap and September 28 pushed price straight back down.
Where this week ranks in the sample
EWYUSDT has 29 weekly candles and 18 weeks were stronger than this one, so this is a weak week rather than its worst. The stronger weeks are spread widely: 2026-05-04 gained 20.26%, 2026-06-08 gained 15.86%, 2026-04-06 gained 12.34%, 2026-04-13 gained 9.09%, 2026-05-25 gained 8.93%, 2026-08-10 gained 8.24%, 2026-05-18 gained 7.15%, 2026-08-31 gained 5.3%, 2026-06-15 gained 5.11%, 2026-07-20 gained 4.76%, 2026-04-27 gained 4.34%, 2026-09-21 gained 2.79%, 2026-08-03 gained 2.73%, 2026-04-20 gained 2.62% and 2026-03-30 gained 2.52%. Three negative weeks still rank stronger: 2026-08-17 fell 0.13%, 2026-09-14 fell 0.19% and 2026-08-24 fell 0.74%.
KORUUSDT has 15 weekly candles with 8 stronger weeks, including 2026-08-10 at 25.29%, 2026-08-31 at 13.92%, 2026-07-20 at 8.63%, 2026-08-03 at 6.99% and 2026-09-21 at 5.98%; negative but stronger weeks include 2026-08-17 at -3.48%, 2026-08-24 at -2.84% and 2026-09-14 at -4.14%. SAMSUNGUSDT has 18 weekly candles with 13 stronger weeks, including 2026-06-08 at 17.68%, 2026-08-10 at 14.03%, 2026-09-21 at 9.46%, 2026-08-31 at 9.33% and 2026-07-20 at 8.83%. SKHYNIXUSDT has 18 weekly candles with 9 stronger weeks, including 2026-06-08 at 23.23%, 2026-06-15 at 19.93%, 2026-08-10 at 14.19%, 2026-08-31 at 10.96%, 2026-08-17 at 9.38%, 2026-07-20 at 6.41% and 2026-09-14 at 5.81%.
What the trending posts say
Trending posts on Square argue that this KOSPI quarter was driven by index heavyweights rather than a broad collapse, so trading Korea-linked contracts requires looking past the index headline and into individual symbols (relayed, not the site's view). Those posts also argue that EWYUSDT, as a US-equity USDT-margined perpetual listed later than the Korean equity symbols, has a shorter weekly sample, so comparing its drawdown directly with KORUUSDT or SAMSUNGUSDT can lead to the wrong conclusion (relayed, not the site's view). Other trending posts note that KORUUSDT and SAMSUNGUSDT swung far more violently between September 28 and September 30 than EWYUSDT did, which raises margin requirements for anyone trading them (relayed, not the site's view). These are Square discussions only, not the site's view, and not a call on direction.
Three ways traders get hurt
Gaps deserve more respect on Korea-linked contracts than on crypto contracts. On September 23, KORUUSDT opened at 23.86 USDT and closed at 21.42 USDT with almost no reaction time; when it bounced to 21.53 USDT on September 25, many assumed the gap would fill, and September 28 took it to 20.44 USDT instead.
High leverage gets ground down by this daily rhythm. KORUUSDT gained 5.95% on September 25 and 5.13% on September 29, which makes it feel like being right on direction pays back, but September 28 fell 5.41% and September 30 fell 5.9%, erasing both bounces in two sessions. SAMSUNGUSDT shows the same shape: up 3.24% on September 25 and 3.62% on September 29, down 6.04% on September 28 and 4% on September 30, more up days but larger single-day losses.
Funding is a hidden cost of holding overnight. It will not save you when you are wrong on direction, and it slowly eats unrealized profit when you are right. As for which week was the best week, that is always a conclusion reached in hindsight: nobody knew 2026-05-04 would close at 20.26% while it was happening, and the same goes for KORUUSDT's 25.29% week on 2026-08-10.
Know the cost first
Binance contract default maker fee is 0.02% and default taker fee is 0.05%. The rebate ratio is 20%, which brings the effective maker fee to 0.016% and the effective taker fee to 0.04%. Against EWYUSDT's 2.25% weekly decline, a round trip on the taker side costs 0.04% after the rebate, and for anyone trading in and out several times a day that adds up to a line item worth tracking.
Source: https://fapi.binance.com/fapi/v1/exchangeInfo
Data as of 2026-10-01; source: Binance public API. Not investment advice.
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Binance is not available in your region. What follows is not a centralized exchange โ it is a different kind of product that you can use:
๐ Binance Web3
A self-custody wallet inside the Binance app; swaps route through on-chain DEX aggregation, not an exchange account
Bind via our link and wallet swap fees drop 30%. On-chain gas and slippage are not covered by the discount.
You must already be a verified Binance user to create a Binance Wallet (official FAQ Q13); wallet referrals and exchange referrals are two separate systems. Zero-fee pairs such as stablecoin swaps generate no rebatable fee.