Family: The Unbreakable Bond - Season 1 Episode 9

The NIS senior/director calls Do-hun and asks if he found the sniper that killed Butterfly and where that bullet hit her. Director expresses his suspicions about Chief Oh being involved in Butterfly’s murder, while at the NIS headquarters, Ma Young-ji tells Chief Oh about Butterfly’s situation and mentions Do-hun was the only agent who was there when Butterfly was killed. It turns out Chief Oh didn’t know Do-hun was the one sent to kill Butterfly.