Supplier Of Myriad Realms

As a Prodigal he was added to the system, but before he could even be happy about it, he was tricked into a mess by the system! With this system he can travel between the Three Different Realms! What？The Fighting Demon World’s Beast God was Sun Wukong in other world? There was another Heavenly Emperor in the Violet Myrtle Realm? Why are there so many coincidences in the Three Realms? Why was the System so shameless? The woman behind the System, whom he called Big Sis, what exactly was her identity? You said you only want me to be a merchant, why are you making it more and more complicated!