In 2019, Sunghyen participated in Mnet's reality show Produce X 101. He was eliminated in episode 5 after ranking 85th. On February 24, 2020, he was announced as one of the members of PLUSWIN Entertainment's new boy group Shooter-X under the stage name Sunghyun.
On April 14, 2021, it was announced that Sunghyun would be withdrawing from the group due to personal circumstances. On April 21, 2024, Seunghyen, along with Geumryul and Hyeonki, were revealed as members of the group EXCEED. On June 15, 2025, it was announced that Sunghyen had signed with the newly established company VARA Entertainment with the stage name WHO.
On June 20, 2025, it was announced that Sunghyen would be departing from EXCEED due to issues with his military service that restricted his overseas traveling. On June 25, 2025, he made his solo debut with the digital single "Who Am I" under the stage name WHO. On August 18, 2025, it was announced that WHO would be making his comeback with the digital single "Wonderland", scheduled for release on August 25.
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