Tie up a Demon to Be a Saint

Why do you have to work hard to complete tasks when traveling through time? Why do you have to be a licking dog if you bind the system? Why should I smile and say "it's okay" when my master is used as a substitute and my senior brother is used as a tool? Sorry, I won't pretend anymore in this life. The system asked me to convert Brother Heihua, and I handed him a knife: "Who do you want to kill? I'll help you." The system asked me to save the sect from crisis, so I sent a message to the enemy: "Fight quickly, don't make me wait." System: [You will destroy the world! I smiled: "Then destroy it. Anyway, this broken world should have been reinstalled long ago." It's just that I didn't expect that the man who was once pushed into the abyss by my own hands would stand in front of me again when I was at my most arrogant. He looked at me, his eyes filled with three thousand years of obsession: "It's time to pay back what you owed me back then."