Seongmin

On December 6, 2019, the finale of World Klass aired where it was revealed that Seongmin (then known as Jerome) finished at eight place earning him a spot in the debut group TO1 (then known as TOO). He clarified through his personal letter for fans that he will be promoting by his birth name Oh Seong Min henceforth. On December 20, 2022, news outlet SPOTV News reported that he, alongside Cha Woong Ki, would be participating in Mnet's survival show Boys Planet as contestants.

On December 29, WAKEONE confirmed their participation on the show, stating that they have decided to apply for the program while deciding their future plans. On March 23, the second eliminations aired where it was revealed he ranked 35th which ultimately got him eliminated from the show. On September 7, it was announced that Seongmin had departed from WAKEONE following the termination of his contract.