ArtistIST Entertainment
Sungjun
Sungjun (성준; real name Moon Sung-jun, 문성준) is a vocalist and member of South Korean boy group TUNEXX under IST Entertainment. Born July 18, 2005, he brings five years of pre-debut training to TUNEXX, a tenure that makes him one of the longer-trained members at debut.
His pre-debut footprint is wider than most rookies. Sungjun sang the group OST "One Last Chance" for the JTBC drama No Tail To Tell (January 16, 2026) and recorded "Rhapsody" for the drama Moon River, sharing vocal duties with Sihwan, Taira, and Zeon. Both tracks showed up before TUNEXX's official March 3 debut.
His public-facing personality leans free-spirited: he describes himself as someone who would choose the ability to fly over invisibility because he "wants to fly freely in the sky." His favorite Japanese word is "shiro" (white). Off-stage comfort is Stephen Sanchez's "Until I Found You," and Running Man was a fixture of his childhood. His soul foods are bread and ice cream.
Sungjun's representative emoji in TUNEXX is the swan (🦢). He considers managing physical endurance one of his personal priorities. TUNEXX debuted March 3, 2026, with their first mini-album SET BY US ONLY, led by the title track "Proof That I Am Alive."
1 articles3 creditsDebut: March 3, 2026South Korean
Fans Also Ask
What is Sungjun's real name and birthday?
Sungjun's real name is Moon Sung-jun (문성준). He was born on July 18, 2005.
What is Sungjun's role in TUNEXX?
Sungjun is a vocalist in TUNEXX, the seven-member boy group under IST Entertainment that debuted on March 3, 2026, with their first mini album SET BY US ONLY.
What pre-debut activities did Sungjun participate in before TUNEXX?
Before TUNEXX's debut, Sungjun sang the OST "One Last Chance" for the JTBC drama No Tail To Tell (January 2026) and recorded "Rhapsody" for the drama Moon River alongside TUNEXX members Sihwan, Taira, and Zeon.
What is Sungjun's representative emoji in TUNEXX?
Sungjun's representative emoji is the swan (🦢). His free-spirited personality is reflected in his stated preference for flight over invisibility, saying he wants to fly freely in the sky.
What are some of Sungjun's personal favorites?
Sungjun's comfort song is Stephen Sanchez's "Until I Found You," his favorite Japanese word is "shiro" (white), and his soul foods are bread and ice cream. He grew up watching Running Man.
