Lee Ji Eun, a girl who loves roses. her boyfriend always brings her a bouquet of roses whenever they go out. Park Jay, a guy who loves to see his girlfriend smiles every time he brings her roses. They are both deeply in love but nothing ever lasts forever "I will bring you roses everyday Ji Eun."

Kim Ah Reum, a girl with heart disease falls in love with a guy she meets in the hospital. Yang Jungwon, a sweet and caring person. But she doesn't want him to know that she's in love with him. She couldn't live longer. She couldn't hurt Jungwon that way. "Loving me must be so hard right? I'm sorry."

'book 1' "Be my boyfriend?" -Jungwon "I'm sorry, your what?!" -Jay Where Jungwon's ex-boyfriend transferred to their college. Jungwon still has feelings for him and asks the school's best basketball player and heartbreaker, Jay, to pretend to be his boyfriend, only to make his ex jealous, nothing more. What happens when Jungwon realizes Jay wasn't pretending?