The two brothers are twins, just different personalities.

Haechan is head of volleyball and head of student executive board. He is also ignorant and stubborn. He is also very popular on campus, he majors in engineering. Many women are amazed, but Haechan always ignores them.

Haechan is a famous person in Korea, a thug, and a child who loves motorbikes and cigarettes. He is so obsessed with cigarettes. He also has a tsundare nature. He is very cool and really hangs out with his friends. He also has a very dominant, harsh character and is very possessive of what has become his property.

Jeno is the Student Executive Board or the chairman, he is handsome and very cool.