What do you think darkness is? Was it corruption? Was it evil? No, no, no. In my opinion, darkness is the other side of light. There is darkness as well as light. The corruption and evil you speak of are evil, not darkness.
Ye Chen had obtained the Dark System and was traveling through the endless dimensional worlds. He wanted to see how Ye Chen would redefine the meaning of darkness and let everyone in the universe remember the power of darkness.