She is like a butterfly staying in his colorless world. The frequency of the butterfly's wings is like the music score he composed. The melodious melody expresses their story. He said that the time when they met was the best time in his life, from meeting when they were young to separation, from reuniting in high school to recognizing each other, from falling in love to losing. Whether she can come back, constantly looking back from the past time.
Purpose: Go back in time to find the one you love