My brother is so stable

Reborn in the ancient times before the Conferred God War, Li Changshou became a small qi cultivator. He had no qi luck, nor was he destined to be the child of a catastrophe. He only had a dream of cultivating immortality.
In order to live in the cruel prehistoric wilderness, he tried hard not to stick to cause and effect, killing will be ashes, doing everything after planning, and never stepping into danger easily.
Hiding cards, cultivating escape techniques, refining erysipelas, palming supernatural powers, unmoving and steady like an old dog, shaking a rock, and leaving quietly after moving.
Originally, in Li Changshou's plan, he would keep hiding in the mountains and cultivate himself to become an immortal. Until one year, his teacher was very quiet and moved, and gave him... a junior sister came back...