It's Not Easy Being Your Love Rival's Big Brother - Chapter 32

A botched rescue mission with an unknown objective cost Zhou Yu his team members, while leading him progressively closer to the multinational biotech corporation Juli’s research core.

In order to protect his botanist younger brother Zhou Qing, Zhou Yu accepted employment under the Juli Corporation, and is dispatched to a parallel world—Nibelungen.

Nibelungen’s biological systems are completely different from the world Zhou Yu is from. To live in this place, Zhou Yu must follow three great laws:

The first law, fear is the sign of the hunted, so you must never show fear.

The second law, the more beautiful an organism is, the more dangerous they are. Do not approach them, and do not trust them.

The third law, do not be misled by the mimicry of S rank organisms. They understand your mind, and they know how to entice you. Always remember that they have no human emotions or love. All humans are no exception to them.

Finally: We wish everyone can live happily in Nibelungen.

- Description from Novelupdates

"God of Mischief is interested in you and wants you to be his emissary. Do you accept?"

With blood and wounds covered his entire body, the voice echoing inside his mind was like that of a hope shining upon him.

In the glorious future era, mankind had discovered the bottom of the sea and conquered the sky, but they also accidentally opened the Pandora box that shouldn't be opened. They found a place where lived numerous unknown creatures.

Here, humans will wrest their lives to step upon their greatest evolution and create their own myths, including Theodore.

Faced with betrayals, surrounded by beasts, and faced with imminent death, he answered with resolve and tenacity.

"Yes!"

In order to chase down and kill her own murderer, Xia Yichu reached an agreement with the 233 system, and she will travel through the world to complete the task, and The 233 system helped her return to the original world.
However, Xia Yichu often encountered a broken BOSS while he was on his way to do the task. He did n’t agree with each other on the wall, the bed, the various patterns, and kept talking.
System: Please use one word to describe the other person’s impression in your heart.
Xia Yichu: Competent.
Shen Jiaye: Mine.

- Description from 69shu

Synopsis is in the beginning first chapter, so you can try to read it first.Zhang Fei is an ordinary human, but he is also an Incubus, and he also a Heavenly Fox.