After Coming Down the Mountain, I Became a True Immortal

If I don’t cultivate immortality, I’ll die. Ye Yan possesses the supreme immortal physique of the cultivation world, but he was born on Blue Star, where spiritual energy has dried up. His constitution is tainted by the foul qi of the mortal world, and when he is on the brink of death, he becomes the disciple of a supreme expert. From then on, he leaves the mortal world behind. But his earthly ties remain unresolved. Once he descends the mountain, I shall become a true immortal. (No System + not reborn + both parents alive + not a saintly protagonist)