Infinite World from Go

Chen Anxia gains the ability to travel through worlds, but needs to complete world tasks assigned by the system to unlock the next journey. Gradually, Chen Anxia discovers that the worlds he travels to are a little different. Because, in the worlds he travels to, there is an additional group of beings known as players. The most crucial part is that these players mistake Chen Anxia for the protagonist. Thus, Chen Anxia is forced onto the path of the protagonist. In the world of Hikaru no Go, there's the character of Takeshi, and in the world of Detective Conan, there's the character of Shinichi Kudo. Chen Anxia has neither of their backgrounds, but he has players from another world!