MTL - Honkai Q&A, Starting with Kiana - Chapter 305

Lambert, one of the great generals from Regios kingdom was suspected for planning a rebellion against his lord at the end of unification war, he died an unnatural death. Two hundreds years later, when the era has changed and Regios kingdom entered it’s peaceful era, he accidentally revived as a demon called Undead Knight.. Lambert whose entire body was wrapped in a flashy Demon Metal[Organ] set out on a journey to punish the wrongdoers while enjoying the peaceful sight of Regios kingdom. But…….. This peaceful era was basically an easy mode for Lambert, the greatest general of the chaotic era.

This is a story of a man named Kim Sae-Jin, who one day, inexplicably wakes up as a Monster. Follow him and his perilous journey to get his life back as a Human, all the while growing even more versatile as a Monster in the process. This should be… complicated, somewhat.

It has been more than ten years since he was transported to another world. The protagonist Deris Fahrenheit, who has became a magician with special circumstances, was freely enjoying his life in this world. However, a girl appeared before him and asked him to make her his disciple. That girl seems to be a transported person――

It’s a story of him who becomes the girl’s teacher and trains her to achieve her revenge (?) in otherworld.

This world has Fox Fairies, River Gods, Water Monsters, Great Demons and Cultivators who seek immortality.

By activating their Dharma Eyes, cultivators can see all kinds of demons and ghosts.

Refining a flying sword, they can kill enemies thousands of miles away.

Their all-seeing eyes and all-hearing ears allow them to observe everything around them…

The second young master of the Qin family, Qin Yun was one such cultivator…

- Description from Novelupdates