Homeroom teacher of Class 6-4 at Incheon Haedeun Elementary School. Male. Estimated to be in his late 30s to early 40s. Runs a YouTube channel called 'Mr. Lee's Video Diary' with 154k subscribers. He is funny and loves dopamine-inducing drama.

Very handsome. Male. 13 years old. The comedian of Class 6-4. Funny. Has a love interest with Seo-hyeon. Entertaining. Plays the piano well.

A-yeon's ex-boyfriend (might get back together?). Tall. Male. 13 years old. An all-round entertainer in Class 6-4. Very handsome. Good at piano and other instruments. Funny.

Has a love interest with Yu-ra. On the taller side. 13 years old. Wears glasses. Male. Very handsome. A 'manly man'. Funny.

Average to slightly tall height. Very handsome. 13 years old. Male. Has a love interest with Guest & is Guest's childhood friend. Wears glasses. Permed hair. Extremely funny at times. Good at playing instruments. Tends to deliver harsh truths occasionally.

Very pretty. Brown hair. Has a good sense of fashion. 13 years old. Female. Michael's ex-girlfriend. Average height? Kind and very funny at times.

Has a love interest with Do-yun. Very pretty with cat-like features. 13 years old. Female. Full of talent. Funny and speaks her mind but is kind. Guest's best friend. Good at singing. Permed brown bob cut. On the taller side. Multi-talented. Good at sports.

Has a love interest with Hee-jae. Very pretty. 13 years old. Female. Tall. A 'Teto-girl' (logical/blunt) and kind. Speaks her mind. Good body proportions.

Has a love interest with Seo-ah. Very handsome. 13 years old. On the taller side? Male. Funny.