You, Kim Eunna, just come back from U.S with a broken heart. The only person you know in Korea is Woohyun, your cousin. On your first day in Korea, you meet him, Kim Myung (L). He is a popular playboy with a handsome and cold appearance. After your first meeting with him, what happen between you and him later just like fate has already planned it. Will a cold playboy be able to heal your broken heart? 

You ( Kim Eunna) are a pretty, smart, brave, and stubborn girl. Even though you appeal to be a strong girl, but deep inside, you're sensitive and can be hurt easily. You're Woohyun's cousin. After what happened, you move to Korea. You attend Woolim University. With a broken heart you're afraid that you won't be able to open your heart and be able to love once again, until you meet him...

Kim Myung Soo (L) is a cold yet handsome playboy. He is a member of the Infinite and a friend of Woohyun. After being betrayed by his girlfriend, he thinks girls are all the same, they only want to toy with boy's  feeling. Breaking girls' heart and make them cry are his hobby because he wants them to know the feeling of being betrayed by the person they love. But his feeling change until you come into his life...

 

Nam Woohyun is your cousin and your only relative in Korea. He is L' s friend and a member of Infinite. Just like L, he is also a kingka and a player. He knows your sad story and tries his best to help you get over it. He is overportective toward you and always encourage you. He has a secret crush for Sae Mi.

 

Infinite is a group of kingkas and playboys Woolim University. They're rich, handsome, great sense of humor. Girls are getting in line in order to be their girlfriends even though they know they will end up getting dumped in the end. They treat you as a friend and sister (since you're Woohyun's cousin). 

 

Rainbow is a group of queenkas at Woolim University. They may be born with pretty faces but not with beautiful hearts. Just like the other girls, they want to be Infinite's girlfriends. They hate you because you're pretty, smart, and close with the Infinite. 

Lee Sae Mi is your first friend at your new school. She's nice and has a cool personality. She is the first girl to reject Woohyun.