Yoochun and his childhood friend Sungmin met Soohyun in high school after seeing her play the flute, and the three became best friends. As a result of the time they spend together, both boys fall in love with her. Yoochun had decided to confess his feelings through a song he wrote for Soohyun's birthday, but before he had a chance to give it to her, he sees her giving a special gift to Sung Min. Devastated, he abruptly ends his friendship with both Sungmin and Soohyun after that. Years later, Soohyun tracks Yoochun down to tell him that Sungmin has died, and she wants him to attend the funeral. Slowly, the truth reveals itself.