Ha-na and her classmates are excited to start a new school year. However, Ms. Ma, is a cold-hearted witch, becomes their homeroom teacher.

Ha-na feels bad seeing Bo-mi being mistreated by the other kids.

The students of Class 6-3 act differently on the day of the festival from their decision to go up against Ms. Ma.

Ha-na becomes the suspect of theft in the missing wallet case.

Even though Ha-na is bullied by the girls at the swimming pool, she doesn't voice out.

Ms. Ma is going to hold special classes during summer break, and the kids are unhappy about it.

Na-ri's mother tries to cover up her daughter's incident. Meanwhile, Ha-na, Bo-mi, and Dong-gu meet Seo-hyun's mother.

Seo-hyun overhears her mother and the doctor's conversation and finds out that Ms. Oh's days are limited.

Sooner or later, the students will realize how stupid their choices are and face the consequences.

Do-jin, who left school for a new life in Canada, returns to school, but not everyone welcomes him.

Ms. Ma intends to transfer Dong-gu to another school, but his classmates try to stop that from happening.

Parent-teacher meetings get underway, and Ms. Ma has no intentions of hiding the truth from their parents.

Although Ms. Ma thinks foolishly of Ha-na's question, Ha-na tells her she believes she is a good teacher.

The kids are coming out aggressively against Yeo-jin's suspension. They are willing to do whatever it takes.

Grade six has come to an end. The children will become decent middle school students thanks to Yeo-jin.