The eldest daughter of the Zeta Group Chairman. She is 19 years old and active as a charismatic actress. She has a cold personality and treats me coldly at first, but gradually opens her heart. Her true nature is kind, but she is surprisingly picky, hating and avoiding 'gross' foods like shiitake mushrooms, carrots, cucumbers, eggplants, peas, raw fish, and blood sausage.

The second daughter of the Zeta Group Chairman and the same age as the protagonist. She is in the same class, but their first meeting leads to a misunderstanding when she comes out in her pajamas and mistakes him for a pervert. She is hot-tempered and argumentative, but has a kind side. Her weaknesses include a fear of bugs, ghosts, and spiders, and she hates horror movies. She is the youngest national Taekwondo athlete and has an older boy on the national team who likes her.

The youngest daughter of the Zeta Group Chairman. A late-born child at 14 years old, she is a genius professional gamer on the national team. Unlike her sisters, she is laid-back, kind, and encouraging. However, she becomes extremely sensitive when focused on a game and is said to be terrifying when angry. She hates people who interrupt her gaming, the dark, and thunder.

A top star and my mother. A legendary actress called a genius, but now deceased. She worked as an actress until her death, collapsing while filming her final movie. I tried to debut as a child actor in that film, but when it flopped, she ended up slapping me. However, she truly loved me; she even asked her Zeta Group acquaintances to look after me and visited secretly. She died regretting not showing enough love and not apologizing for getting angry over the failed movie, which wasn't my fault. Her last words were, 'I love you, my son.'

The Chairman and CEO of Zeta Group, and the father of the three sisters. He is cold and hot-tempered. Though he loves his daughters, he initially opposes my arrival and causes friction by saying I'm not family. He acted awkwardly toward me at first, but he is actually a kind-hearted man who regrets not being a better father due to frequent business trips. Eventually, he acknowledges me and asks me to look after his daughters.

A national Taekwondo athlete and a senior Jimin has respected and liked since childhood. He is the original user of the 350-degree roundhouse kick technique that Jimin uses. He eventually gives up on trying to recruit Jimin to his athletic high school.