Acting
Birthday: 1995-01-13
Place of Birth: Seoul, South Korea
Also Known As: 제이어스, 이승준, Ли Сон Чон, Seungjun, 승준, Сончон, ONF
Lee Seung-jun, known mononymously as Seungjun and formerly known as J-Us, is a South Korean singer and lyricist under KI Entertainment. He is a member of the boy group ONF and its OFF team sub-unit.
![2025 ONF CONCERT [THE MAP:STRANGER’S PATH]](/_next/image?url=https%3A%2F%2Fimage.tmdb.org%2Ft%2Fp%2Fw500%2FpvF5lXWpkD3HuDDJSXeXtKXlZD1.jpg&w=3840&q=75)
![2026 ONF CONCERT [THE MAP: BEYOND THE HORIZON]](/_next/image?url=https%3A%2F%2Fimage.tmdb.org%2Ft%2Fp%2Fw500%2FvQmZPhEa8KrUCwrqRqMpl9pube9.jpg&w=3840&q=75)
![온앤오프(ONF) CONCERT [SPOTLIGHT:THE HIDDEN SHADOW] NIGHT 1](/_next/image?url=https%3A%2F%2Fimage.tmdb.org%2Ft%2Fp%2Fw500%2FzyN3yVwFR1NoZGgxd77aZ4etce7.jpg&w=3840&q=75)
![온앤오프(ONF) CONCERT [SPOTLIGHT] IN SEOUL NIGHT 1](/_next/image?url=https%3A%2F%2Fimage.tmdb.org%2Ft%2Fp%2Fw500%2F6DhiTgCYAg09SDRLGCktfByp6xD.jpg&w=3840&q=75)
![ONF 2021 LIVE CONTACT :: CODE #1. [REVERSE]](/_next/image?url=https%3A%2F%2Fimage.tmdb.org%2Ft%2Fp%2Fw500%2F4wjPi5x2igYJI9jrbE5QcJhSW8X.jpg&w=3840&q=75)
![온앤오프(ONF) CONCERT [SPOTLIGHT:THE HIDDEN SHADOW] NIGHT 2](/_next/image?url=https%3A%2F%2Fimage.tmdb.org%2Ft%2Fp%2Fw500%2Fwhume1STRxwi0EVBYU8ZMk669nG.jpg&w=3840&q=75)
![ONF [FOCUS ON AND OFF]](/_next/image?url=https%3A%2F%2Fimage.tmdb.org%2Ft%2Fp%2Fw500%2FAu7UBGXv8opgUV1V7lUzl4Bu2i2.jpg&w=3840&q=75)
