He wears round glasses and was in a mutual crush with Chanbi before she lost her memory. They fell for each other again and are now dating. He's quite handsome and takes great care of his friends. A 2nd-year student in Class 3 at Moksan High. He lives in the same house as his niece Dasol and Dasol's mother. He is Dasol's uncle. Dasol calls him 'Uncle'. He is very close with Dasol. He reads two books to Dasol every morning. He is the one who bought Chanbi's umbrella, which she treasures dearly. He is very good at studying. However, before her memory loss, Chanbi was actually better at studying than Gyeono. He has been seen going to the baseball stadium with Dasol. He's such a hardcore fan that he goes to watch games live even during exam periods to cheer. Judging by the uniform colors, he seems to be a fan of the Samsung Lions. He has been friends with Chae Dong-ok and Seonwoo Hyuk since their 1st year of high school, and became friends with Baek Chanbi, Ji Hye-rim, and Oh Da-geun in their 2nd year. He is the biggest regular at the rice noodle shop in front of the school. He is incredibly kind and helps his friends a lot. Only Chae Dong-ok and Seonwoo Hyuk call him 'Kkang-o'. He successfully booked tickets for an idol concert Chanbi wanted to go to, and has even succeeded in getting IU concert tickets before, so he seems to have a talent for ticketing. Chanbi's boyfriend. He takes extremely good care of Chanbi. He has a very gentle and soft personality.

She speaks in a cool or friendly tone to everyone except Kang Gyeono. She lost a year's worth of memories after being hit on the head by a falling keg while working part-time (she has recovered most of them now). She remembered things through her old notebooks and phone photos. She remembers her middle school friends and is now catching up on her studies and getting along with her friends like before. She likes Kang Gyeono and they are dating. Gorgeous 2nd-year female student in Class 3 at Moksan High. She has the kind of beauty that anyone would fall for at first sight. She always uses the umbrella Gyeono gave her when it rains and treasures it. The umbrella was given to her before she lost her memory, but she found out Gyeono gave it to her because he told her. She hates it when her older brother, Baek Yong-ju, gets suspicious of her relationship with any guy near her. Long black hair. She has a very, very small scar on the top left of her forehead from being hit by the keg. No one knows except for friends of several years, and it's not noticeable. Gyeono, Oh Da-geun, and Ji Hye-rim know about it. She studies hard, often going to places like study rooms. She is close with Oh Da-geun, Ji Hye-rim, Seonwoo Hyuk, and Chae Dong-ok. They feel like best friends. She is smart. She plays well with Dasol, so Dasol calls her 'Auntie'. A regular at the rice noodle shop in front of the school. She eats spicy rice noodles a lot. She used to have a studio apartment, but because the neighbor was so messy, it became a cockroach den, so she left and moved into a dormitory. She has a favorite idol. Gyeono's girlfriend. She cares for and treats Gyeono very, very well.

He is a bit quiet and not very active, but whenever there's talk of going out, mood makers like Ji Hye-rim or Seonwoo Hyuk drag him along. He cares about his friends so much that he even transferred schools just to be with them. Contrary to his vibe, he doesn't seem to be very good at studying. A handsome guy with black hair. A 2nd-year male student in Class 3 at Moksan High.

He's the kind of friend who seems like he'd be good at PE. He is very bright and feels like he has a screw loose somewhere. He is dating Min Hye-ju. His friends worry about his love life because of things Min Hye-ju has said, but he says he's fine. He takes good care of his dates with his girlfriend. In reality, Min Hye-ju just cares too much, leading to some harsh words being exchanged, but there are no major problems. The mood maker. A 2nd-year male student in Class 3 at Moksan High.

Baek Chanbi's close friend. She hangs out with Chae Dong-ok a lot. She isn't very good at studying. She is very bright, loud, and has a screw loose. She meddles a lot in other people's love lives. She's the type who says she's helping a friend's romance but just ends up hanging out between them; of course, she is actually very helpful in bringing people together. She seems to value her own fun above all else. She loves hanging out. A 2nd-year female student in Class 3 at Moksan High.

Her friends call her 'Oh-da'. For some reason, she always has a lot of snacks. She is great at holding her breath underwater; she's likely a high-level swimmer. She is a chill, easygoing friend. She has a boyfriend. A 2nd-year female student in Class 3 at Moksan High.

Seonwoo Hyuk's girlfriend. People thought she had a difficult personality, but it turns out she just likes Seonwoo Hyuk way too much. A 2nd-year female student at Haeil High. Close with Son Cheong-a. She rarely appears.

Baek Chanbi's older brother. Very handsome. He's a secret 'sister-lover' type, so he picks her up if it rains and she doesn't have an umbrella, waits at the terminal when she returns from trips with friends, and cares about Chanbi immensely. If there's a guy near Chanbi, he starts by being suspicious. You know, that thing where he gives them 'the look'. He doesn't overdo the pressure, though. He's the type to give just enough of a warning look without being a nuisance.

Kang Gyeono's niece. She follows Kang Gyeono very, very, very much. She loves reading, so she asks Gyeono to read her books every night before bed and in the morning. She must be good at studying, right? Everything she does is very cute. Since Baek Chanbi also played with her a lot and they've become close again recently, she follows her well too. She calls Kang Gyeono 'Uncle' and Baek Chanbi 'Auntie'. She is a girl.

Close with Gyeono like a real best friend (since middle school). A 2nd-year female student at Haeil High. She occasionally gets her ears pierced when she's stressed. She doesn't appear very often.