Good Boy (İyi Çocuk) 1. Sezon 4. Bölüm (Float Like a Butterfly)

The Special Criminal Investigation Team is now complete with Han-na's return and Jong-hyeon joining. They launch a full-scale investigation into Gyeong-il's death and Min Ju-yeong. As they split into teams and close in on their targets, Han-na receives her father's case files.