The lyrics are from "Anhe Bridge" originally sung by Song Dongye.

According to NetEase Cloud Music query, the lyrics of "Anhe Bridge" are "I know there are too many regrets in this world, so hello, goodbye. Did you ever say that you would go to the north to see the snow scene? In a flash, it's already gone. It was a promise made ten years ago, and I promised that I would play the piano for you at the concert."

"Anhe Bridge" is a song cover by Song Dongye at the concert. The lyrics say, "I know that there are too many regrets in this world every day, so hello and goodbye, in a flash, now we are gone." It was a promise made ten years ago. I promised that I would play the piano for you at the concert, and I will let you listen to my songs as you travel far away." It expressed Song Dongye's longing for his old friend and his regret at not being able to fulfill his promise.