I Relied On Roasting To Be Body Cultivation Master summary:

Xiao Ye unexpectedly finds himself in the world of cultivation, hoping to embark on the path of immortality. However, he is tested and found to have no spiritual roots. Fortunately, he is bound to a system that allows him to gain physical abilities through roasting. He is then entangled in the tragic annihilation of the Xiao family, where he is mistaken by Xiao Xin, the legitimate daughter of the Xiao family, as one of their own. He clings onto his senior sister's thigh while investigating the reasons behind the Xiao family's extermination, all while relying on roasting to achieve enlightenment through his physical body.