Tetsu

Tetsu (테츠), born Guo Wun Jhe in Taipei on January 28, 2003, is the Taiwanese leader and rapper anchoring AmbiO under E Entertainment. He was the first member introduced during the team's September 2025 rollout, which made him the public face of a group built around multinational chemistry instead of a standard single-market trainee story.

That positioning fits his role inside AmbiO. Tetsu gives the group its most direct performance center, balancing rap parts with the kind of controlled on-stage presence rookie teams usually need time to build. Before the official debut, AmbiO tested that identity through the pre-release run of Runnin', I Wish, and Click, then turned the early momentum into the March 18, 2026 mini album Boys Be Ambitious.

What makes Tetsu notable is not just the leadership title. He represents the more outward-facing side of E Entertainment's second major boy-group push after E'LAST, and his Taiwan-born profile gives AmbiO a clearer regional reach from day one. As the group expands its content and live schedule, Tetsu remains one of the key reasons the act feels built for a broader Asian audience rather than a domestic-only rookie lane.