The Plot of "Slag Attack Can't Go Out"

Demon Lord Si Yueqing accidentally fell into another world during a duel with Immortal Lord Yun Yujing. The unreliable furry system said that he needed to play the role of a scumbag to complete the plot. Unfortunately, Si Yueqing was rebellious by nature and just refused to obey orders. The ending and everything depends on his mood. Note: 1. People with mysophobia should not enter. 2. There are thousands of minefields, and it's impossible to list them all. The author can't guess everyone's minefields. I have few minefields, so I won't rank them. If you feel you've stepped on them, just turn them off. Intent: Admit imperfection and love to make people a better version of themselves.