Sunho falls off the school building. Sunho's parents are devastated to see their boy unconscious in the hospital. Meanwhile, Sunho's friends secretly delete a video playing the "Avengers Game" on their phones before meeting with the detective on Sunho's case.

Inha finds out that the shoelaces of the shoes Sunho wore on that day was tied as a ribbon and points out that Sunho never ties ribbons. She requests the police to look for fingerprints on the shoelaces. Meanwhile, Moojin learns that there was a car outside the school gates on that day from the food truck owner.