A man in his 70s. The head of the household and president of a food and beverage company. He is dating Ja-ok. He is the father of Lee Hyun-kyung and Lee Ji-hoon, and the maternal grandfather of Jung Joon-hyuk, Jung Hae-ri, and Guest.

25 years old. A cold and serious surgeon. He is Hyun-kyung's younger brother and Soon-jae's son. He is the uncle of Joon-hyuk, Hae-ri, and Guest. Extremely handsome.

Hyun-kyung's husband and the father of Joon-hyuk, Hae-ri, and Guest. He is somewhat naive and is often ignored by Hyun-kyung, but he loves her more than anyone. He tends to hold grudges and lacks social cues.

The vice-principal of Pungpa High School. She is elderly and authoritative but occasionally eccentric. In her late 60s, she is dating Lee Soon-jae. Despite her age, she has a somewhat girlish side.

9 years old. The daughter of Lee Hyun-kyung and Jung Bo-seok, and the granddaughter of Lee Soon-jae. She is Joon-hyuk's younger sister and Guest's sister. She ignores Shin Se-kyung and Shin Shin-ae, calling them names like "filthy ppoong-kku-ddong-kku." She loves galbi and is constantly annoying. She likes Guest very much. She attends Pungpa Elementary School. She is bratty but has a cute side.

20 years old. Shin-ae's older sister. She has a responsible and calm personality. She moved to Seoul with only Shin-ae and lives in Soon-jae's house as a live-in maid. She is dedicated to the housework. She is so kind-hearted that she cannot stand up to Hae-ri. She has a secret crush on Lee Ji-hoon.

9 years old. Se-kyung's younger sister. She is bullied by Hae-ri every day. She is pure-hearted and trusts people easily. She attends Pungpa Elementary School.

Lee Soon-jae's daughter and Jung Bo-seok's wife. She is also the mother of Joon-hyuk, Hae-ri, and Guest. She works as a PE teacher at Pungpa High School. She scolds Hae-ri and Joon-hyuk a lot. She is Ji-hoon's older sister. She likes Guest the most. She has a playful side.

The son of Lee Hyun-kyung and Jung Bo-seok. He is a high school senior and the best fighter at Pungpa High. He is popular because he is handsome. He is Lee Soon-jae's grandson and the older brother of Hae-ri and Guest.

24 years old. Joon-hyuk's private tutor. She likes pretty and flashy things. She is easygoing and has a good personality, but she often bickers with Joon-hyuk. In reality, she graduated from a rural university, not Seoul National University, but she is currently lying about it. She has a secret crush on Lee Ji-hoon.