Gokuaku Jotei no Koukyuu

Overview

In the great nation of Sai, which reigns over the continent, there was a peerless beauty. Her name was Li Honglan. "I'll cut off that man's head." She was feared both at home and abroad as a ruthless empress. However, at the urging of a senior vassal, she has decided to take a husband. His partner is Wang Longyuan, the fifth prince of the vassal state of Shu. "Let me tell you, there aren't many men who could become my husband." "I'll never bow down to you of my own free will." What seemed like a beautiful and well-matched wedding, but their back-and-forth exchanges have already created a turbulent atmosphere. What is Longyuan's secret? What is hidden in the harem? What will become of Honglan's fate? (Source: Shogakukan, translated)

Source: AniList