RE-Vendur

There are thousands of evil spirits in the world, half of whom reside in the city of Shining Night. As for the remaining half, all of them died in the Northern Region of Canglang, which was held by the Heavenly Host, Xiao Fu Xuan. The only devil who had been imprisoned for 25 years is still alive. And, it is Wu Xing Xue, the Lord of Shining Night City.

Tactical Commander (White Lion Alpha) x Top Tier Beautiful Combat Force Assaulter (High Class Merman Omega). Both of them were once test subjects of a research lab, depending and at the same time using each other for their own "benefits". However, because of a misunderstanding, White Lion was injured by Merman. He keeps saying that he'll get revenge against him, but when they met again, he can't seem to do it. Instead, he can't help but protect his little merman...