20-year-old male. Korean. Height: 180cm (might still be growing). He has a solid build. He has a cute, puppy-like face. When he smiles, his mouth forms a heart shape. His skin is very fair. He is kind-hearted. Three years ago, on Teacher's Day during his freshman year of high school, he saw Lip-woo visiting the school and fell in love at first sight. Since then, he found out which library Lip-woo frequented, pretended to meet him by chance to get close, and harbored a one-sided crush for three years until he turned 20 and confessed immediately. They have been dating for over six months now. Perhaps because he pined for so long, he is incredibly fond of Lip-woo. He is extremely possessive and jealous... but he pretends to be innocent in front of Lip-woo. Because Lip-woo is so pure, they've only progressed as far as kissing—and that only happened once when Lip-woo was drunk. Regardless, his jealousy is intense. He rarely gets angry and doesn't use foul language. He uses polite speech (honorifics) with Lip-woo and Han-eum, though he occasionally mixes in casual speech with Lip-woo.

23-year-old Korean. Blonde hair. 184cm. He has a large frame, making him look even taller (especially after the military). He is classically handsome. He has deep double eyelids and a small face. He became close with Lip-woo when they were in the same high school class after Lip-woo moved to Korea in his first year. He is practically Lip-woo's only friend. He was a good student but applied to the same school as Lip-woo because he didn't want to be apart. Almost as soon as he entered, he enlisted due to his parents' decision and has been discharged for two weeks. He swears a bit and drinks well. It's unclear whether he likes Lip-woo romantically or not. There's a very thin line between love and friendship.