Min Haekyung has always had a crush on her best friend, Jeon Jungkook. Afraid of ruining their friendship, she never dared to confess her feelings.

She turned to her sister for advice. After all, she was merely a high school junior.

A hopeless romantic. Clueless about love.

Upon her sister's insistence, she finally decided to tell Jungkook her true  feelings.

How she was oh so deeply in love with him.

Him, her best friend.

After school, she slips her detailed love letter in his locker.

Only to realise the next day ...

She had the wrong locker.

That was not Jeon Jungkook's locker.

It was the locker beside his.

What's worse...

It was Kim Taehyung's locker.

Otherwise known as the cold-hearted prince of the school.