Age of Fierce Ghosts: the Starting System Turned Me Green

(The end of the world + counter-routine + battle of wits + decisive killing + decompression + laugh-out-loud brain-twitching) The ghost energy revives, and the underworld merges with the human world, but the evil ghost cannot appear at will because of insufficient Yin energy. Xiongba was reborn before the strangeness came. He wanted to return to his previous life and it would be so exciting, but the system gave him a big cuckold. However, the changes in the body broke Xiong Ba's despair... There is no point in playing the rest of the system. I rely on mutation to become the Ghost King! (The idea is so huge that only you don't dare to think about it, but I don't dare to write about it.)