One person: He secluded himself for eighty years and cured Tian Jinzhong.

[Invincible protagonist + high-ranking main character + making up for regrets + daily life of an elderly group + lighthearted and humorous]
Su Wuxian transmigrates into the world of "Under One Person" and becomes the junior brother of the Old Celestial Master.
However, the system forced him into seclusion for eighty years, and when he emerged, it was already the time of the Luo Tian Grand Ceremony!
Looking at Tian Jinzhong in the wheelchair, Su Wuxian immediately unleashed a [Dual Perfection Hand] (Red and Blue Hand Ultimate Version).
"Second Brother Pig, stand up! If you're not sick, walk around a bit!"
……
On this day, the three elders of Longhu Mountain descended the mountain.
Wang Ai: "Run! That troublesome devil who gives even the Old Master a headache is coming down!"
Zhang Chulan: "Master, please tone it down! You've practically destroyed the company!"
Feng Baobao: "This child has the scent of immortality on him, it smells so good, I want to bury him."
The protagonist of this book is upright and mentors younger generations. If you feel this is about being a babysitter, please move on, thank you!
The synopsis is insufficient; please proceed to the main text to see how the twenty-year-old ancestor with the face of a hundred-year-old restores order to the world of supernatural beings!