In Episode 9 of Good Boy, the drama deepens as Dongju (Park Bo Gum) grapples with guilt and determination after a crucial piece of evidence vanishes. As the team struggles to recover from past trauma, they now face interrogations, high-stakes chases, and silent moments of solidarity. Han So Hyun (Kim So Hyun) stays quietly by Dongju’s side, while Jong-ha, Lee Sang Yi, and Manik Hyo retrace every step in search of the truth. A powerful episode filled with emotional weight, quiet strength, and unbreakable bonds.