Even the strongest feeling can fade .

Even the smallest mistakes can be seen .

Even the happiest moments end . 

Like the story of Choi Jin-ri and Choi Minho . 

Choi Jin-ri's world is revolving on Choi Minho's . She did all her best for Choi Minho to notice her. 

Until One day , like a wind , she just fade away . Without everybody noticing it . Without a single word from her. 

When she left, Minho realized that he should be the one to make the efforts . He should be the one to tell Sulli his feelings . Not the other way around. He regret ignoring every efforts that Sulli did just to make him notice her . 

Then in a blink of an eye , she came back . She wants to forget him but she can't . 

Minho did his best for Sulli to forgive him and love him again . But fate made it's own choice.