Sion

Oh Si-on (오시온), known as Sion, is the leader and lead vocalist of NCT WISH, the final fixed unit to emerge from NCT's expansion arc under SM Entertainment. Born in Mokpo on May 11, 2002, he entered SM after being discovered through Instagram DMs, then spent roughly four years inside the company's training system before the public rollout began. That long runway shows in the way he anchors NCT WISH. He carries the group's center of gravity without forcing it.

SM introduced Sion as one of the pre-selected members tied to NCT Universe: LASTART, then positioned him at the front of NCT WISH's February 2024 debut with WISH. From there, he has stayed at the core of every major release, including WISHFUL, poppop, COLOR, and the 2026 full-length set Ode To Love. His tone gives the group its clean emotional line, while his calm authority keeps a Japanese-majority lineup connected to the wider NCT brand in a way that feels natural rather than assigned.

That mix of patience, vocal control, and low-friction leadership is why Sion matters. He is not just the oldest member in the room. He is the member who makes NCT WISH read like a complete group instead of a concept still being assembled.