[1] Heo was the bronze medalists at the 2012 World Junior Championships in the boys' singles and team event,[2] and Asian Junior Championships in the team event.

[3] Heo later won the boys' singles and mixed team gold medals at the 2013 World Junior Championships,[4][5] and the mixed team silver medal at the Asian Junior Championships.

[6] In the senior level tournament, Heo was the semi-finalists at the 2017 U.S. and 2018 New Zealand Open.

[7][8] He competed at the 2018 Asian Games and at the 2020 Summer Olympics, is best known for upsetting top-seeded Kento Momota in the group stage of the latter tournament.

[9] Boys' singles The BWF World Tour, which was announced on 19 March 2017 and implemented in 2018,[10] is a series of elite badminton tournaments sanctioned by the Badminton World Federation (BWF).