Song Hyeri (17) wants to escape from her everyday life. She decides to commit suicide. But before she does that, she writes her very first and last fanmail to her favourite idol, stating how much she admired him and how much happiness he brought to her. Worried about the content of the letter, the idol decides to track her down. When he finds her, Hyeri is too embarressed to tell the truth. She makes up the lie that she only has a few months to live because of an illness. The idols ask their manager if they could stay with her until her time's up, by giving her backstage passes to all their performances and the chance to hang out with them whenever she wants. Their manager approves, but makes clear that he would make the story public, so there won't be any dating rumors. The guilt grows, the lie becomes bigger and love starts to blossom. How will Hyeri handle this when the whole world is watching? 

"I don't have much time left, that's why I wanted to let you know how I feel about you."