- Hwansung was close friends with Kangta from H.O.T. Kangta wrote a song for NRG entitled 'NRG: Sorrow (2001)' in dedication to Hwansung when he passed away.
- Fans speculate that he was considered the visual of NRG for his prince-like visuals and delicate facial features.
- During his lifetime, he popularized the long shoulder-length hairstyle, which is still popular today among K-pop idols like TXT's Choi Beom-gyu and Stray Kids Hwang Hyun-jin.
- He became a singer almost by accident; one day, he randomly just went to an audition because he felt like it. Despite not expecting any outcome, he ended up passing the audition.
- Hwansung was in a trio called Kkaebi Kkaebi and then in a project group with Shoo (S.E.S), Son Hoyoung, and Danny Ahn from g.o.d before he debuted in NRG.
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