Ui Ryu

Jin's brother and K's teacher. He's a guy with a twisted personality and a bit narcissistic. He died in the plane accident that killed Jin's parents too but it's revealed that Jin was supposed to die in the crash but he took her place. He was supposed to die at age twenty but made her miss the trip and made a wish to K to take care of Jin for him. Apparently he's been reborn multiple times. *From Wikipedia*