Cha Jun Ho

In 2019, Cha Jun Ho participated in Mnet's boy group survival show Produce X 101 representing Woollim Entertainment. He finished in ninth place, thus becoming a member of X1. The group officially debuted on August 27, 2019 with the mini album, 비상 : Quantum Leap.

However, on January 6, 2020, the agencies representing the members announced the group has disbanded due to not being able to reach a unanimous agreement following the Produce 101 vote manipulation controversy. On May 31, 2020, he, as part of Woollim Rookie, participated in the agency's artist collaboration single "Relay". On September 4, it was confirmed that Cha Jun Ho would be debuting in Woollim's new boy group, DRIPPIN, in October 2020.