Dreamed of Becoming a Dharma God, but Became a Slave of the Demon King

I traveled to a different world and accidentally bumped into the beautiful blonde demon king. "Choose! Become my slave, or be miserable for the rest of your life?" "... Is there a third option?" "Yes, you will be miserable for two lifetimes." "What's the difference?!" In this way, I was forced to become the unlucky Saint. Only by cultivating the God of Dharma can the curse of the Demon King be broken. Ask me why I didn't choose a slave? That is of course a man's dignity! Even if the other party is a beautiful blond girl devil, he can't step on me. In short, I bet my dignity as a man and embarked on the path of magic.