BX (비엑스) is a South Korean rapper under C9 Entertainment. He is the leader of the boy group CIX. In October 2017, he became a contestant on the survival show MIXNINE. He ranked 9th in the finale, thus becoming a member of the final group. However, the group's debut was ultimately cancelled. In November 2018, BX became a contestant on the survival show YG Treasure Box. He was eliminated in the show's final episode. He debuted as a member of C9 Entertainment's boy group CIX on July 23, 2019 with the mini album 'Hello' Chapter 1. Hello, Stranger.