The Child Who Would Not Come: Part 2 (S01E06)

So-Ah is a teacher at a nearby school, intrigued by Boo Young-Suk, a student whose unsettling presence lingers on the attendance sheet yet remains unacknowledged by anyone. Her efforts to encourage Boo Young-Suk to return to class lead to a series of bizarre occurrences around the school. The more she delves into his mysterious situation, the creepier things become, leaving her questioning the connection between Boo and the eerie happenings.