Um Won-sang

A graduate of Ajou University, in 2019 he signed his first professional contract with Gwangju FC, hailing from his hometown, and was given the number 17 shirt. On March 3, 2019, in the first game of the season against Seoul E-Land, Um made his professional debut, coming in for the injured Kim Jeong-hwan at the 39th minute and being involved in a 2–0 win for his side. He also debuted in the national FA Cup, scoring a goal in the "Griffins"' win against the representatives of the Andong College after a penalty shoot-out: he didn't take part in Gwangju's following game (a 3–0 loss against Suwon Samsung Bluewings) and several K League 2 matches, as he was involved in the FIFA U-20 World Cup. Mainly used as a substitute throughout the first half of the season, he featured more frequently in the starting XI during the second half, and scored his first goal on September 1, when he netted the opener against Ansan Greeners, but couldn't avoid Gwangju's 2–1 final defeat. He added another one on October 27, taking part in his team's 3-0 win against Suwon FC. Um concluded his debut professional season with 16 total appearances and two goals, contributing to the "Griffins"' victory of the league title and consequent promotion to the K League 1. In 2020, Um missed Gwangju's first three games of the season: however, he scored on his debut in the top-tier league, as his team drew 1–1 with Ulsan Hyundai. Manager Park Jin-sub soon established him as a frequent starter of his side, as Um…

He represented South Korea at several youth levels. In 2018, he took part both in the Toulon Tournament, where the South Korean selection was eliminated in the group stage, and the AFC Under-19 Championship, where he helped his side reach the final by scoring a goal against Qatar in the semi-final. However, South Korea eventually lost 1–2 to Saudi Arabia. In 2019, he was selected by head coach Chung Jung-yong to take part in the FIFA U-20 World Cup in Poland. He usually came off the bench (except for the group stage game against South Africa, where he was a starter), but still contributed in the Taeguk Warriors' road to the tournament's final, then lost to Ukraine with the score of 3–1. In 2020, he was selected by head coach Kim Hak-bum to be part of the squad that would participate to the AFC U-23 Championship in Thailand. Featured as a starter against China, Uzbekistan (in the group stage) and Australia (in the semi-final), he often found himself alternating with Lee Dong-jun on the right wing and eventually contributed to the Taegeuk Warriors' first victory of the competition, as they beat Saudi Arabia after the extra-time in the final and qualified for the Olympics. He got his first senior international call-up from head coach Paulo Bento for the international friendlies against Mexico and Qatar on November 14 and 17, 2020. He subsequently made his full international debut in the latter match, coming in for Hwang Hee-chan at the 76th minute.

As of 9 December 2025

Gwangju

K League 2: 2019 Ulsan HD

K League 1: 2022, 2023, 2024 Individual

K League 1 Best XI: 2023 South Korea U19

AFC U-19 Championship runner-up: 2018 South Korea U20

FIFA U-20 World Cup runner-up: 2019 South Korea U23

AFC U-23 Championship: 2020 Asian Games: 2022