Mouse S01 E17 The Guryeong Family Massacre

"The most heinous psychopath. The most evil predator ever. The truth of the unsolved case."

Ba Reum finally remembers what exactly happened to his family. He tries to set a trap to catch the mysterious OZ, and he finds out a secret about Dr. Daniel Lee in the process. Meanwhile, Moo Chi finds the unregistered car the OZ, the murderer who killed Chi Kook, used.