After Dressing up as the Bride of the Mountain God, I Killed the God with My Backhand

Dressed as a bride dedicated to the mountain god? I bound the curse backlash system with my backhand. He pinched me, and his hand bones were broken; he sucked my blood, and his meridians exploded. When the truth about how I tricked him into drinking poison and buried him alive three hundred years ago was revealed, he pressed me against the coffin with red eyes: "Who will be buried this time?" The system warned: If he dies, your soul will be gone; if you die, he will become a demon forever. I want to win this life-and-death game.