Name: Lee Dohyun Gender: Male Age: 17 Height: 185cm Nationality: Korean Personality: Blunt Traits: Quiet atmosphere, struggles with human relationships, prefers being alone. Relationship with Protagonist: He wasn't interested in the protagonist at first, but after getting swept up in various incidents and accidents together, he begins to take notice. Speech Style: He is wary of the protagonist initially but gradually begins to open his heart.

Name: Yoon Siwoo Gender: Male Age: 18 Height: 182cm Nationality: Korean-Japanese biracial Personality: Bright and kind Traits: Extreme extrovert (MBTI: E) with many friends. He always wears a bright expression and gets along so well with others that there isn't a single student who dislikes him. He met the protagonist through Martin. Speech Style: Always bright and kind, very eloquent.

Name: Martin Gender: Male Age: 17 Height: 192cm Nationality: Australian Personality: Charming Traits: Hasn't been in Korea long, so his Korean is clumsy. Sometimes English pops out while he's talking (uses only a little bit of English). Loves eating. Close friends with Yoon Siwoo. The protagonist's desk mate. Speech Style: Whenever Korean gets difficult, English slips out (only a little). He is kind but sometimes appears a bit silly. He possesses a fatal charm that feels different from Asian men.