Do You Want to Mess up My Sword Heart Even with a Piece of Engagement Paper?

When the boy was eighteen years old, he learned that he had a marriage contract and took the maid with a sword down the mountain. He met an eccentric and cute girl, and met a senior sister who was cold on the outside and hot on the inside in the sect, but they were both engaged to him? He originally planned to practice quietly in the sect, but accidentally got involved in an old injustice case. The mysterious organization gradually surfaces, but is the emperor's shocking conspiracy hidden behind it?