Hyeokkyu Kwon is moving from FC Nantes to the "Fächerstadt". The second division club did not specify the exact length of the contract. It is reported that no transfer fee is involved. Mario Eggimann, KSC's sporting director, said they are very pleased to be able to sign Hyeokkyu Kwon permanently. He stated that Kwon is notable for his vision as a distributor in build-up play as well as his size and athleticism as a strong worker in duels. Eggimann added that they are convinced Kwon will bring stability to their game and develop further with them. Kwon said that in discussions with those responsible, the club's path and his opportunities for development were outlined to him. He also stated that in Karlsruhe, there are top conditions for him to develop further and put himself in contention for selection for the World Cup in the summer.

Hyeok-kyu Kwon has left Nantes and signed with Karlsruhe. Nantes and Karlsruhe reached an agreement for the definitive transfer of the South Korean midfielder, which involved no fee for Nantes.

Hyeok-kyu Kwon is joining second-division club Karlsruher SC from FC Nantes. According to Sky, the 24-year-old defensive midfielder has signed a contract with the German side until 2028 and has also completed his mandatory medical examination. Karlsruher SC reportedly secured the signing over numerous competitors from Belgium and Poland. The South Korean is a U23 international and has 10 caps for his country. This season, he has made 12 appearances for Nantes in Ligue 1, having joined the club in July 2025. His market value is currently listed by Transfermarkt as €1.00m. He moved to Nantes from Celtic for a reported sum of €250,000, and had previously joined the Scottish club for €1.0M.