Yong Jun Hyung and Park Sa Rang have been schoolmates for a very long time. They don’t get along though, despite them seeing each other every day. Desperate for love, Sa Rang goes on internet and signs up in a love chat website she heard her friend talking about. After a couple of days, she gets a conversation with a guy she doesn’t know. With Jun Hyung being the other guy and both of them not knowing whom the other person is from different username —hers being HYORI and his being JOON— they set up a date at their school. After Jun Hyung found out it was Sa Rang, he stands her up and plans on playing with her heart. But after she goes out with Hyun Bin, his classmate and good friend, he starts falling for her. Not knowing the guy is Jun Hyung still, she tells him everything about her life and relationship. He goes to her as JOON and Jun Hyung and comforts her in any way he can. Not wanting to show their affection for each other, they drift apart from each other. Will she turn back to Jun Hyung or stay with Hyun Bin? Will their love be a success or failure?