Your first love from high school is back ! It turns out that he already have a girlfriend and he wil engage soon. But guess what? Because an accident, He will engage with your sister! YOUR OWN SISTER.

You think you can accept this fact, but why does your heart still ache when you see him with her? You're supposed to be happy for both of them. Am I right?

So...Can you forget him?

You/ Park Hye Rim

Park Hye Rim/ You. You’re living in Seoul now with your parents. You just graduate from university. You have 1 older sister, Jiyeon.

You’re Myungsoo ex girlfriend when both of you still in high school.

You have a cheerful, and easy going personality but you can be serious and mature too.

Kim Myungsoo

Kim Myungsoo. He lived in Seoul but he move to America for study in one of the university there. His father is one of the most rich guy in Korea.

He is Hye Rim’s ex. Because of an accident, he choose Jiyeon to become his girlfriend.

He is cocky, arrogant, a player who doesn’t interested in a serious realtionship. But once he found his true love, he will protect her with all of his power.

Park Jiyeon

 Park Jiyeon. Hyerim’s/your eonni. She study in America but decided to take a break and go back to Korea for a while.

She is Myungsoo’s girlfriend, but she still doesn’t know that Myungsoo is her sister’s ex.

She is fun,easy going, talkative and sometimes can be very stubborn. She acts cute as if she is younger than Hye Rim sometimes. But she can be a good big sister too by giving advice and solve Hye Rim’s problem. But she can’t solve THIS problem right?

Nam Woohyun

Nam Woohyun. A young CEO of one of the big company in Seoul which is owned by his father.

He will be Hye Rim’s new boss.

He is a calm, patient, sweet, and humble guy. But he prefer working than start a realtionship, but it's all change whe he finally meet Hye Rim.