The Kospi opened 0.26% higher on Tuesday, buoyed by gains in US equities and a cooling of geopolitical risks in the Middle East.
The modest advance marks a continuation of the positive momentum that swept through Asian markets earlier in the week, as investors digested signs of de-escalation in regional conflicts.
The rebound in Seoul follows a similar pattern across the region, where Asian equity markets opened higher on Monday.
That initial move was driven by renewed optimism surrounding diplomatic efforts between the United States and Iran, with investors responding positively to reports that the two governments intend to engage in further dialogue.
The easing of tensions has helped alleviate concerns over potential supply chain disruptions and energy price spikes, providing a tailwind for risk assets.
In the US, stock markets also opened higher on Tuesday, marking a shift in sentiment after several days of declines.