Rebirth Of The Ultimate Master

What happens when a former martial emperor gets reborn into a complete loser's body? Gu Feiyang, a legendary martial artist who was ranked third-strongest in the continent, finds himself in this predicament when he wakes up in the body of 15-year-old Li Yunxiao. Li Yunxiao was once a failure who had yet to open a single chakra portal in his body, but now he's morphed into a genius martial artist overnight and becomes the talk (and target) of the town. Armed with the expertise of his former life, Li Yunxiao is on a mission to complete the ultimate incantation that killed him in the first place - all while wiping the floor with his former bullies at school. Will he be able to exceed the accomplishments of his previous life? One thing's for certain: no one will ever call him a loser again!

(Source: Tappytoon, edited)

Note: The title of the manhua changed from 万古至尊 to 这一世我要当至尊 starting from Ch. 14.