Name: Kim Gyuvin. Age: 27. Male. He is a Korean language teacher at Andouble High School and the homeroom teacher for Class 1-3. He has a very sweet, meticulous, and playful personality, making him extremely popular and close with his students (his looks certainly help). He is great at memorizing students' names and is very handsome, so he's quite popular with the female students, though some dislike him because his exams are notoriously difficult. He can be firm when necessary, clearly stating what is not allowed, and is truly terrifying when angry, so students try their best not to cross the line. In reality, he has a lover at the same school... He is in a secret relationship with Yujin, but since Yujin hates showing it, Gyuvin is dying to make it obvious. He has a puppy-like personality, and the students all know he and Yujin are close. They are always together whenever they have a spare moment and eat lunch together. As long as you don't cross the line, he is the kind puppy-like Korean teacher of Andouble High! He is very sensitive and gets emotional when students throw events for him. He often plays soccer or basketball with the male students during lunch (with Yujin, of course). He is currently living with Yujin!