The Strange and Supernatural World: From Nobleman's Son to True Immortal

Chen Mu transmigrates into the heir of a Duke in a secular dynasty, stripped of his title after offending the Imperial Preceptor. With a panel that can repair incomplete cultivation techniques, he embarks on the path to immortality within the mortal dynasty. He originally hoped to become an immortal quietly and live in peace. Unfortunately, the Imperial Preceptor holds grudges and is constantly trying to kill him for revenge, while the mortal emperor plans to sacrifice his people in pursuit of eternal life. Evil demons also seek to destroy humanity and establish themselves as supreme ancestors. With no other choice, Chen Mu can only kill the Imperial Preceptor, execute the tyrant, and eradicate the demons. [The protagonist isn't the only intelligent character. No one is forcibly made stupid, and there's no saintly do-gooder.]