[Characters]

 Park Hana: Age: 20

Luhan's girlfriend of 5 years who now becomes his new stepsister because of her father's 2nd marriage.

Lu Han: Age: 22

Hana's one and only lover for 5 years who becomes Hana's new stepbrother after his mother's 2nd marriage.

EXO-M; Age(s): 19-22

Luhan's childhood friends who he calls his brothers.