Episode #1.9 - S1-E9
Continuity mistake: When Sang-cheol tries to wake up Jun-u after knocking him unconscious, the action figure that Jun-u was holding can be seen on the ground, beside his right forearm and to his right. In a wide shot, the action figure has moved forwards; now it is ahead of his arm, and it positioned to the left of his right forearm. (00:33:50)