Quick Transmigration: I’m Supporting Character B

A story about a protagonist who, after traveling through many worlds and witnessing every facet of life and countless beautiful sights, gradually becomes a happy-go-lucky slacker. They won't go out of their way to interact with the original protagonists, or deliberately avoid them. The protagonist has a life of their own.

(Some characters have one-sided crushes on the protagonist; the protagonist appears as both a man and a woman in different worlds; the protagonist is powerful; no fixed pairing.)

P.S. The first two worlds aren't written very well, since I was still practicing, so feel free to skip them. It won't affect the later plot. The tags were added by the System. I wouldn't tag it as both historical romance and no romance.