Bei returned to his former home in Kitakyushu, where he lived, and found that every tree in front of him remained the same, and even the hotel he had lived with his grandmother when he was young was still the same. it wasn't until a little boy ran past that he was astonished because he turned out to be himself when he was 10 years old! When I opened the newspaper, I realized that I had traveled through time and space on the way, and I came to the company 20 years ago, that is, in 1986. By coincidence, he stayed in his grandmother's hotel and remet his sister, whom he admired for many years. When he was young, he had a better relationship than ambition and harmony, and his eldest sister taught him how to play the violin. Unfortunately, he later died of illness, leaving a mark in his heart. When he returned to the past this time, Bei Zhi decided to turn his life around, but could he save Harmony? Can we forgive the regrets of the past?