Jaewoo Byun

Jaewoo Byun (Byun Jaewoo, 변재우) is a South Korean competitive programmer who represented the Republic of Korea at the International Olympiad in Informatics (IOI) in 2025 and 2026. He won gold at IOI 2025 (24th worldwide, 448.70/600) as a 2nd-year student at Gyeonggi Science High School, and silver at IOI 2026 in Tashkent, Uzbekistan (41st, 352.99/600) as a 3rd-year. He competes on Codeforces as byunjaewoo.

Notes4

• Won IOI 2025 gold (24th, 448.70/600) and IOI 2026 silver (41st, 352.99/600), a rare two-time IOI national-team medalist for South Korea.Aug 13, 2026
• Was only a 2nd-year student at Gyeonggi Science High School at IOI 2025, then 3rd-year at IOI 2026 -- a strong early high-school trajectory typical of Korea's elite science-high pipeline.Aug 5, 2025
• At IOI 2026 (Tashkent, Uzbekistan) took silver as Korea won 2 gold, 1 silver, 1 bronze overall; Korean-submitted problems 'Tiling Game' and 'Partition' were official.Aug 19, 2026
• Part of the 2025 Korean IOI delegation that took first place overall with four golds; national team teammates include Jung Min-chan, Yuchan Lee and Mingyu Woo.Aug 5, 2025
• Two Codeforces handles appear across sources (byunjaewoo on cphof, jaewoo2009 in the IOI 2025 team blog), a common sign of a renamed/secondary competitive-programming account.Jul 30, 2025