Uri Baek

Sul Baek's twin sister, Uri behaves in a rebellious manner, uncaring for her surroundings or even her sister whom she shows to despite and not respect most of the time.
She is seen messing around with guys, avoiding to associate with her sister and smoking during school.
The job she holds seems to be something equivalent of a hostess in Japan.
After reading Sul Baek's letter she comes to hell too.