Valkyrie's Shadow - Chapter 1The Paladin of the Holy Kingdom, Part III: Act 4,

Everyone in the City of Jing thinks that bestowment of marriage between Xian Junwang and the daughter of the Yi’an Marquis House is to insert a fresh flower into manure.

While the demons were rising, mankind was about to become extinct. Six temples rose and protected the last territory of mankind.

Su Yuzhou reincarnated into the ABO world after his death and became a top-level alpha. Influenced by the conceptions of his previous life, he never thought that a susceptible period would have any effect on him – after all, as an upright young man, how could he be enticed by pheromones to push down a weak Omega?

Then, he became the one who was pushed down _(:з”∠)_

Atypical ABO story, Omega Gong X Alpha Shou.

- Description from Novelupdates

He—an enigmatic and cold-blooded soldier with a mysterious background.
She—a ruthless and bloodthirsty spy.