Jung SooJung is a second year university student in Seoul, who always had bad luck with men. She hoped to find the love of her life in university, but as summer is coming closer, she starts giving up on hope. That is, until she gets a letter from anonymous person. Just with that one letter, her love life is turned upside down. So, who wrote that letter?

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JUNG SOOJUNG

Second year in Seoul University;

Sad history of love life;

Majoring in Arts, loves to draw, dreams of becoming a designer;

Big dreamer, likes to assume things;

Has two personalities;

Hard to make friends;

Really clingy and wants to change that;

Parents live in USA, older sister SooYeon lives with her in Seoul.

KIM JONGIN

Second year at Seoul University, has some lessons with SooJung;

Bad boy, likes to party, but doesn't have any close friends;

Doesn't want to have a girlfriend, only one-night stands;

Seems interested only in popular girls;

Majoring in Arts, wants to be a professional dancer;

A rabel, likes to skip lessons a lot;

Quite popular on campus;

Parents live in Europe because of business, so he lives alone.

LU HAN

SooJung's chilhood friend;

Was studying in China's university majoring buisiness, ended his studies;

Came back to Seoul and Lives alone as SooJung's neighbour;

Currently a CEO of his family buisness;

Dreams of living independently and opening a cafe;

Acts cute and nice, but likes to play around with girls;

Really outgoing;

Changed a lot during years at university;

LEE TAEMIN

Third year in Seoul university;

King of the campus;

Majoring in buisiness;

Keeps his true self and his dreams as a secret;

Everybody likes him, he's really outgoing and friendly;

One of the best students in university;

Dislikes Jongin;

Has anger issues nobody knows about.

CHOI JINRI

Second year at Seoul university;

Is SooJung's only friend since highschool;

Distances herself from SooJung;

Majoring in Arts;

Wants to become an architector;

Popular in campus, has a lot of friends;

Changes boys like socks, doesn't believe in love;

Currently works as a model as a part-time job.