Sin has a happy-go-lucky and optimistic disposition, and while he isn't the most well-spoken and can be cocky at times, he has a big heart and tries to improve his shortcomings one at a time. He feels uncomfortable in orderly situations and is not too good at social dispositions. While his personality that doesn't look back on what's done may seem insensitive, his simple and innocent personality can be refreshing. Even though he's young he's strong as he looks.