In January 2018, Hong moved from the youth team of Ulsan Hyundai to SpVgg Unterhaching.

[2] After a loan spell at Juniors OÖ, Hong played one season in the Austrian Bundesliga for LASK before moving to Gent in the Belgian Pro League in August 2022 in the aftermath of an ACL injury suffered by Buffalos striker Tarik Tissoudali, becoming the first Korean to play for the club.

[8] On 29 August 2024, Hong joined Bundesliga club Mainz 05 on a four-year deal until 30 June 2028.

[9] Hong was included in South Korea's under-15 squad for the boys' football tournament at the 2014 Summer Youth Olympics in Nanjing, China.

This biographical article related to a South Korean association football midfielder is a stub.