Uncle Li of Immortality

Li Tianniu travels to a cultivation world and binds to an Immortality System, gaining life, magical power, and spirit stones for every year he lives. The system grants him invincible immortality but not eternal youth. As time passes, he ages from youth to an elderly man with white hair, forcing him to traverse the cultivation realm to find a method to reverse aging. Along the way, he lives low-key, listens to countless stories of the mortal world, befriends loyal companions, and witnesses countless separations and deaths. Facing bullying and pursuit, he never starts trouble but adheres to eradicating threats at the source. On his long journey of immortality, Li Tianniu pursues his youth while keeping his true self, walking toward an unknown immortal path amidst laughter, absurdity, and lonely partings.