Once upon a time, there could have been an us. 

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Both Eunbi and Yuna are secretly in love with each other. The problem is, when Eunbi confessed to Yuna, the other rejected her. In result to that, Eunbi got broken by the girl whom she never she would be grateful for rejecting the latter's feelings. 

A few months later, having to move on feom Yuna, Eunbi had once again fell in love. Worst, with a stranger.