ArtistIST Entertainment
Sihwan
Kim Si-hwan (김시환), known as Sihwan, is a vocalist and songwriter of South Korean boy group TUNEXX under IST Entertainment. Born November 28, 2005, he first gained public attention as a contestant on Mnet's Boys II Planet survival show in 2025, where he was eliminated at 48th place before IST Entertainment selected him as a debut member of the agency's new group project.
Sihwan distinguishes himself within TUNEXX as one of the group's primary songwriter members. He co-wrote the debut title track Proof That I Am Alive and the b-side 100% alongside fellow members Donggyu and Zeon, both produced under the overall supervision of renowned hitmaker Choi Gyu-sung of Black Eyed Pilseung. His creative involvement gave TUNEXX genuine ownership over their debut material from day one.
TUNEXX pre-debuted with the drama OST One Last Chance for No Tail To Tell on January 16, 2026, before officially debuting with mini album SET BY US ONLY on March 3, 2026. The seven-member group, formerly known as 0v__x0, combines the keyword TUNE with X to signify something unclassified and cross-genre. Sihwan's ESTP energy is frequently cited by bandmates as one of his defining stage qualities.
1 articles3 creditsDebut: March 3, 2026South Korean
Fans Also Ask
Who is Sihwan?
Sihwan (시환), born Kim Si-hwan on November 28, 2005, in Busan, South Korea, is a vocalist and songwriter in TUNEXX, IST Entertainment's seven-member boy group that debuted on March 3, 2026. He previously competed on Mnet's survival show Boys II Planet.
What is Sihwan's role in TUNEXX?
Sihwan is a vocalist and lyricist in TUNEXX. He co-wrote the lyrics for 100% on the group's debut mini album Set By Us Only (March 2026), alongside members Donggyu and Zeon, demonstrating his creative contribution from day one.
Was Sihwan on Boys II Planet?
Yes. Sihwan competed on Mnet's Boys II Planet, the survival show that helped introduce several TUNEXX members to the public. He was eliminated in episode 8 after ranking 48th place before eventually being selected as a debuting member of TUNEXX under IST Entertainment.
What is TUNEXX's debut album?
TUNEXX debuted on March 3, 2026 with their first mini album Set By Us Only. The four-track release includes the title track Proof That I Am Alive and additional songs 100%, Obsessed, and Twenty Something. Sihwan contributed to the album's lyrics.
What was Sihwan's first release with TUNEXX?
Before their official debut, TUNEXX released One Last Chance as an OST for the drama No Tail To Tell on January 16, 2026, making it the group's first public release. Sihwan participated in this pre-debut track alongside his six groupmates. The group then officially debuted on March 3, 2026 with Set By Us Only.
