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Gong Hi-ji stands up for her friend who is excluded in the Charatting Single
Party organized by Club Med. She cannot endure these injustices, such as
the smoking high school students or company between young girls and
middle-aged men in return for money. The moment she is about to begin
attack, her dream boy appears. But he is the head of Club Med named Kim
Hyeon-jun. Whether he is the enemy or not, she falls towards him, and starts
to take action. She sneaks into the hotel room where he sleeps, and finally
gains his diary. Hyeon-jun's schedule and hobbies, and all about him are
valuable information for her. From this information, Hi-ji goes everywhere
Hyeon-jun goes, at times softly and at times strongly. Although she is
annoying, Hyeon-jun finds her cute. Before long, he finds out that it is all part
of her plan and what is worse is that his fiance appears. Still, Hi-ji doesn't
give up until the day she sings "Oh! Happy Day." She starts a project with
friends, family, cousins and all the people she knows in order to achieve her
goal.