Transmigrating to Another World: I Have a Door to Anywhere

[The Myriad Worlds + Any-Door + Transmigration + No System + No Torturing the Protagonist]

It starts with a single door, and the Myriad Worlds are yours to explore.

The moment Yang Ji stepped through the doorway,

he found himself in countless unknown worlds:

a Western-style town, a strange and terrifying room, two giant creatures battling, and a city brimming with futuristic technology.

A radiant portal that can take you to any world, at random.