Seunghan made his debut as a part of RIIZE in September 2023. In August 2023, a month before RIIZE's official debut, Seungahn was hit with the first controversy as one of his acquaintances leaked pictures of him kissing his former girlfriend.
Just 2 months following his debut, the idol was embroiled in various controversies leading to a temporary hiatus from activities.
While RIIZE continued as a six-member group, on October 11 it was announced that Seungan would be resuming his activities. Shortly after that, SM Entertainment revealed that the idol would be parting ways with the group following the backlash.
Following several controversies, SM Entertainment announced in November 2023 that Seunghan will be taking an indefinite hiatus and reflecting on his past actions.
On October 11, SM Entertainment confirmed that RIIZE's Seunghan will be officially ending his hiatus and rejoining group activities in November 2024.
As announced on October 13, Seunghan decided to part ways with RIIZE. In his letter, this idol wrote that he was thinking too much about himself and that this was causing harm to the members and the company, which led him to wonder if it was okay for him to continue.

The 21-year-old decided that it was the best to leave RIIZE.

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