Hong Hyun-seok

Early career

In January 2018, a youth player of Ulsan Hyundai, Hong was loaned to German 3. Liga club SpVgg Unterhaching. On 27 February 2019, he made his professional debut, coming on as a substitute for Lucas Hufnagel in the 84th minute of a 3. Liga match against VfR Aalen. In the summer of 2019, he was once again loaned, moving to Austrian 2. Liga club Juniors OÖ. After two years at Juniors OÖ, he joined LASK, making his first permanent move. During the 2021–22 season, he played for LASK at the Austrian Bundesliga and the UEFA Conference League.

Gent

On 8 August 2022, Hong moved to Belgian Pro League club Gent in the aftermath of an ACL injury suffered by striker Tarik Tissoudali, becoming the first Korean to play for the club. On 12 August, he scored a spectacular overhead kick goal in a 3–1 away win over Oostende, where he made his debut. While adapting quickly at Gent in the first season, he had 5 goals and 5 assists in 31 Pro League matches, and 1 goal and 4 assists in 12 Conference League matches. His rapid growth at Gent led him to join the South Korea national team.

Mainz 05

On 29 August 2024, Hong joined Bundesliga club Mainz 05 on a four-year deal until 30 June 2028. During his first season at Mainz, he played as a substitute for main attacking midfielders Lee Jae-sung and Paul Nebel in 19 matches excluding four starts.

Loan to Nantes

On 30 July 2025, Hong was loaned to Ligue 1 club Nantes, with an option to buy. While…

Hong was included in South Korea's under-15 squad for the 2014 Summer Youth Olympics held in Nanjing, China. He played all four matches as a starter, earning a silver medal.

Club

As of match played 1 June 2026

South Korea U17

Summer Youth Olympics silver medal: 2014 South Korea U23

Asian Games: 2022