Peter Chan used the movie "If Love" to say that everyone's life is like a movie, and they are the protagonists in that movie. Sometimes they will think that they are also the protagonists in other people's movies, but they may only be a supporting role with only one scene, and their footage may have been cut long ago. I actually don't know it yet.
Later I discovered that I had always been in trouble in other people's movies, not because I didn't have a leading actor, but just... I didn't find the right one.