Jimin Seo
Yonsei GSIS Newsletter, Junior Editor

If you have opened any Korean financial news lately, the headlines look almost unreal. The KOSPI, Korea's main stock index, just brushed against the 8,000 mark for the first time in history. A year ago it was sitting around 2,600. That is a jump of over 200% in twelve months, and even people who follow markets for a living are not sure whether to call it a boom or a bubble.

Here is quick vocabulary, that the ‘domestic’ market means stocks listed in Korea on the KOSPI and KOSDAQ, so Samsung Electronics, SK Hynix, Hyundai Motor, LG, and so on. The ‘foreign’ market, for most Korean retail investors, really means US stocks, usually bought through ETFs tracking the S&P 500 or Nasdaq. For years, Korean retail money has been quietly leaving the domestic market for US Big Tech, which is part of why this story matters.

Two forces are driving this month. The first is the AI chip rally. Samsung Electronics and SK Hynix together now account for nearly half of the entire KOSPI's market cap, which is why the index keeps setting records and why analysts keep warning about concentration risk. Around them, Hyundai Motor jumped over 14% in mid May and LG Electronics climbed more than 50% in a single week, both on robotics excitement. The second is geopolitics. President Trump threatened to lift tariffs on Korean exports to 25%, plus a 15% tariff on Korean pharmaceuticals, which has bounced the index around violently. The KOSPI fell over 7% intraday after briefly breaking 8,000.

This is where the government has been busy. To pull retail money back into domestic stocks, the Ministry of Economy and Finance is rolling out a new "Productive Finance ISA," a domestic-only version of the existing Individual Savings Account. An ISA is basically a tax-advantaged investment account: you put money in, invest in eligible products, and pay no tax on a chunk of the gains. The current tax-free limit is 2 million won (4 million won for lower income earners), with discussions to raise it to 5 million or remove the cap entirely. The new Productive Finance ISA will only accept domestic stocks, domestic stock funds, and policy funds like the National Growth Fund. The pitch is simple: stop sending your money to US ETFs, and the government will sweeten the tax treatment if you stay home.

There is no clean takeaway here. Some analysts argue the KOSPI could hit 10,000 if the AI cycle holds and others say it could collapse back to 4,500 if chip demand slows. What is clear is that the Korean domestic market is, for the first time in a long time, the most interesting market and the government is doing more than usual to make sure ordinary people are part of that story. If you have been thinking about opening an ISA, this is probably the year to actually read the fine print before deciding.