Lee Seungjoon
Known As: J-USBorn: 13th January, 1995Age: 31Birthplace: Seoul, South KoreaBiography: Lee Seung Jun, better known by his stage name J-US, is the leader, vocalist and dancer of the boy group ONF. On December 27, 2021, he enlisted as an active-duty soldier.
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![2025 ONF CONCERT [THE MAP:STRANGER’S PATH]](/_next/image?url=https%3A%2F%2Fimage.tmdb.org%2Ft%2Fp%2Fw500%2F%2FpvF5lXWpkD3HuDDJSXeXtKXlZD1.jpg&w=384&q=75)
![온앤오프(ONF) CONCERT [SPOTLIGHT] IN SEOUL NIGHT 1](/_next/image?url=https%3A%2F%2Fimage.tmdb.org%2Ft%2Fp%2Fw500%2F%2F6DhiTgCYAg09SDRLGCktfByp6xD.jpg&w=384&q=75)
![ONF 2021 LIVE CONTACT :: CODE #1. [REVERSE]](/_next/image?url=https%3A%2F%2Fimage.tmdb.org%2Ft%2Fp%2Fw500%2F%2F4wjPi5x2igYJI9jrbE5QcJhSW8X.jpg&w=384&q=75)
![온앤오프(ONF) CONCERT [SPOTLIGHT:THE HIDDEN SHADOW] NIGHT 2](/_next/image?url=https%3A%2F%2Fimage.tmdb.org%2Ft%2Fp%2Fw500%2F%2Fwhume1STRxwi0EVBYU8ZMk669nG.jpg&w=384&q=75)
![2026 ONF CONCERT [THE MAP: BEYOND THE HORIZON]](/_next/image?url=https%3A%2F%2Fimage.tmdb.org%2Ft%2Fp%2Fw500%2F%2FvQmZPhEa8KrUCwrqRqMpl9pube9.jpg&w=384&q=75)