Return of the Demonic Instructor

The world is destroyed by a demon invasion and Bigang Sa is forced to serve in the demon army for centuries. After a failed human uprising, Bigang transports himself back into his body, ten years before the arrival of the demons. Can he use his centuries of demon warrior training to create a new class of murim fighters powerful enough to ward off the coming invasion? **Original Novel:** [Naver Series](https://series.naver.com/novel/detail.series?productNo=3503693) **Original Webtoon:** [Naver Webtoon](https://comic.naver.com/webtoon/list?titleId=840473), [Naver Series](https://series.naver.com/comic/detail.series?productNo=12784054) **Official Translations:** [English](https://www.webtoons.com/en/action/return-of-the-demonic-instructor/list?title_no=9262), [T.Chinese](htt