The video you mentioned, which I saw in Tik Tok, is actually two lovers who didn't end up together. Although there will be regrets, facts are facts. This is something that can't be helped. It's cruel for two people, but they can only face it calmly.

You need to find this song, which is the background music of this video. It should be someone who said to accompany you to your old age. Are you still there? The title of the song is so long, you can search and listen. Personally, I prefer Han Xiaoxiao's version, which really makes people feel particularly emotional.