MTL - Martial Arts Murdering Nine Heavens - Chapter 684 Fairy King

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

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.

In the year 4 Before the New Calendar, just four years before the arrival of the Great Tomb of Nazarick, Lyle finds himself sitting by the roadside, gnawing on a piece of coarse black rye bread. His gaze is hollow, tinged with despair—he has been transported to the world of Overlord.The prospect of facing the devastating events to come chills him to the bone. In just a few years, the Great Tomb will unleash its might, razing nations and reshaping the world. Lyle foresees two grim paths ahead: perishing in the cataclysmic aftermath or surviving to live under the rule of the Sorcerer Kingdom.But as hopelessness threatens to consume him, a unique panel materializes before his eyes: Innate Ability: “Player”.Armed with the same advantage as the feared entities of Nazarick, Lyle resolves to carve his destiny. If they're all players in this grand game, why should he cower before them? The race against time begins as he seeks to grow stronger, navigate the treacherous world, and defy the fate that looms ever closer.

To correct the mistakes of his past, a young man is forced to narrow the space between science and witchcraft, as he ventures on a quest to save his world from complete destruction.