1. Lee Jihoon (Main Character)
Personality: Quiet, Very Cold, Shy, Good at piano skills (have won almost all oscars and medals as he perform), Very smart, Student of Year 2.
Music he played: Piano, Drums, Guitars, and Pipe/Flute.
2. Kwon Soonyoung (Main Character)Personality: Loud loud loud, Energetic, Friendly, Funny and Witty, Popular, Student of Year 2.
Music he played: Guitar and Harps
3. Jeon Wonwoo (Side Character)Personality: Gentle, Neat, Very Smart, Shy, Cold, Student of Year 1.
4. Kim Mingyu (Side Character)Personality: Handsome, Popular, Very Sporty, Girls-Magnet (Although he's gay), Gentleman, Good-boy.
Music he played: Guitar and Drums.This is only spoiler characters..
You will meet more in the story ^^