Overview: If you had the chance to go back in time and change one thing in your past, what would you change? Win, a 44-year-old office worker, lives a life without purpose after losing Nut, his best friend, who passed away along with the dreams they had once shared. One day, fate takes him back to his 17-year-old self. This time, Win is determined to fulfill the dreams written in Nut's diary by forming the band they once started together. He aims to take them all the way to the Star of Band competition stage. However, the more he tries to change the past, the closer the clock ticks toward Nut's inevitable end. Win begins to fear that he might lose Nut once again. This time, will he have the courage to confess the feelings he's kept inside for the past 20 years?