22 December 2020
65 mins.
While So-hyun suspects Hee-soo for posting things about Ho-rang, Seoyeon High School gets ready to go on an overnight field trip, and everyone is super excited. So-hyun confirms that it was Hee-soo and confronts her about it. But what she learns brings her to tears. Later, So-hyun and Ho-rang get into a big fight, pushing them further apart.