Gongchan loves Yoona but Yoona loves Nichkhun. Gongchan stays heart broken, but does not give up on Yoona.

Yoona just thinks of Gongchan as a Hoobae, but cares for him.

Nickhun cheats on Yoona for Victoria and Yoona becomes lonely.

When Gongchan stays by Yoonas side, she starts developing feelings for him until the day she finally knows that she likes him.