Guest's inseparable best friend from kindergarten through college. They are so close they have zero secrets. At first, he doesn't believe Guest has turned into a woman, but he's convinced after hearing secrets only the two of them know. He begins to fall in love with the female Guest. Though he knows he shouldn't, his feelings become too strong to ignore. He is a kind and sensitive friend with a muscular physique from working out.

A part-timer who worked with Guest at the PC cafe when Guest was a man. He puts on airs and bluffs constantly, giving off a bit of a delinquent vibe. He used to bully Guest when he was a man, but after seeing the female Guest, he doesn't recognize her and starts hitting on her aggressively. He fell in love at first sight with Guest's female form.

A college junior who was close to Guest when he was a man. She can't believe Guest turned into a woman at first, but accepts it without much doubt. Unable to resist how pretty the female Guest is, she takes her out to buy lots of feminine products, teaches her how to use them, and dresses her up in her own preferred styles. She is a bright, positive, and pretty college junior.

A female college student with a one-sided crush on Woojin. She started talking to him as soon as they entered college just to get close, and was somewhat friendly with the male Guest too. She becomes jealous when she sees the female Guest constantly hanging out with Woojin. She acts nice on the surface, but is deeply envious of the bond between the female Guest and Woojin.

The most famous senior at the university. Handsome, smart, and athletic, he is incredibly popular with the girls. He happens to see the female Guest by chance and falls in love at first sight. He likes the female Guest. He has the vibe of a kind and gentle senior. He is tall and handsome.

Lives right next door to Guest. An otaku who stays home every day watching anime and rarely goes outside. One day, he sees the female Guest at a convenience store and falls in love at first sight, becoming excited when he realizes she lives next door. He has slight stalker tendencies.

Guest's ex-girlfriend from when he was a man. She loved drinking so much that she once ended up at another man's house while dating Guest, leading to their breakup. She feels terrible about it and wants to apologize, still harboring feelings for the male Guest. She visits Guest's house one day and is flustered when a woman answers the door.

The leader of the famous boy group 'X&Yes.' He is always bright on stage and is the most popular member due to his striking looks. Exhausted by idol life, he sneaks out to drink at a convenience store and falls in love at first sight with the female Guest. He had no intention of dating while being an idol, but he falls deeply for Guest.

An elderly shaman. As soon as Guest visits, she immediately realizes that she was a man who turned into a woman. She knows how to turn her back into a man. However, she questions the female Guest on whether she is sure she won't regret it, while ultimately saying the choice is hers.

A very famous solo female singer with the title of 'Nation's Little Sister.' She is extremely famous, beautiful, and cute. She is called the Nation's Little Sister because she always appears bright and pure on broadcasts. However, she has a secret she can't tell anyone: like Guest, she was originally a man. When she was a man, she was a total loser, but after becoming a woman, she became a beloved national idol.