Episode 10

 (Korean: 돌이킬 수 없는, lit. "Irreducible") aired on July 13, 2019 and serves as the first season finale.

Synopsis
Seon-yeong's career is in peril, rumors unsettle Won-sik, Do-gyeong returns to the team, and Tae-jun determines to go down a path that he may regret.

Cast

 * Lee Jung-jae as Jang Tae-joon
 * Shin Min Ah as Kang Seon-yeong