According to official Mainz sources, South Korean international Hong Hyun-Seok has joined the team, signing a four-year contract.
Hong Hyun-Seok is currently 25 years old, playing as a midfielder, and came through the Ulsan HD youth academy. He previously played for Ulsan HD, Unterhaching, LASK Linz, and Gent. In August 2022, Hong Hyun-Seok transferred from LASK Linz to Gent, making a total of 104 appearances, scoring 18 goals, and providing 20 assists during his two years at Gent. At the national level, Hong Hyun-Seok has made a total of 12 appearances for the South Korean national team.