[2] He is the 2024 World Champion in the men's 200m freestyle and won 6 medals in the 2022 Hangzhou Asian Games.

[citation needed] In July 2021, he represented South Korea at the 2020 Summer Olympics held in Tokyo, Japan.

[11][12] In the freestyle relay event, the team did not advance to compete in the final.

[13] At the 2022 World Championships, Hwang won silver medal in the Men's 200-metre freestyle.

In the final, on 20 June, he finished 1:44.47 In December 2022, he won gold in the Men's 200 metre freestyle event at the 2022 short course FINA World Swimming Championships (25m) with a time of 1:39.72, beating the previous Championship record that was set by Lithuania’s Danas Rapsys in 2018, as well as setting a new Asian record.