MTL - Start with Batman - Chapter 364 Gatekeeper

Chu Feng crossed the Jiuzhou Continent and inherited the Ancestor God Blood Pearl, cultivating until he became a Peak Martial Emperor. By chance, he saved an exquisitely beautiful woman with whom he fell in love and married. Unexpectedly, the woman turned out to be the Empress of the Jiuzhou Empire, and after giving birth to twins, a dragon and phoenix, she left without saying goodbye. Through numerous rigorous cleansing and marrow-washing sessions conducted by Chu Feng, these young children astonishingly developed supreme Divine Runes within them, capable of suppressing all forms of energy across Jiuzhou. Three years later, while dull and adorable, the invincible but unaware siblings, took advantage of Chu Feng’s secluded meditation during Crossing the Divine Tribulation, sneakily slipped out of the village, and embarked on a journey to find their mother.

The countries of Mephius and Garbera have been waging a war for ten years and are trying to put an end to this long fight through a political marriage between the two royal families. Orba, who was driven from his home because of the war and was forced to become a gladiator, looks exactly like the crown prince of Mephius, and it has been decided he will be substituting him during the wedding ceremony. On the other hand, Vileena, the princess of Garbera, has secretly decided to ensnare the crown prince for her own country’s interests.

On the distant Tianxiu Planet, there exists a group of unusual and intelligent beings. They consist of neither children nor elders. They have neither birth nor real death. They are born into the world through an extremely special process and have managed to keep their fundamental memories of survival through their endless reincarnations.

They are the Tianxiu people.

For every Tianxiu person, if they find someone they like and want to bind as partners with each other — then they would have to go through a life or death Adult Ceremony. The winner of the ceremony will become the absolute dominant in this spousal relationship.

While the defeated one will be referred to as — Qizi.

- Description from Novelupdates

Chu Qiao was known as Agent 005 within the Secret Service’s 11th Division in her former life. She was locked up in the Secret Service’s prison as she was framed. After she successfully broke out from prison, she sacrificed her life bravely to preserve the Secret Service by defusing a bomb meant to wipe them out.