Director Baek holds a mock trial where students play the roles of judges, prosecutors, defendants, and witnesses before he resigns from university. Tae-gook is invited to the event and plays the role of the presiding judge without knowing that the case for the mock trial is very similar to the one of Na-jung’s death 10 years ago. Meanwhile, the skeleton in Yeongpyeong District gets identified. Will it be confirmed to belong to Na-jung?