A terminally ill nanoengineer gains a second life through reincarnation, becoming Jang So-cheon, a humble disciple of the Extreme Heaven Sect. Upon arrival, shocking truths reshape his understanding: the Sect Leader has already lived 400 years, and the Grand Elder exceeds 900 years of existence. Compared to his previous fate, Jang So-cheon's new path glimmers with infinite possibility. Drawn to this realm's potential for eternal life, Jang So-cheon dedicates himself to a singular purpose: attaining immortality. The world conspires in his favor, presenting miraculous opportunities at every turn. Ancient spirit herbs centuries old reveal themselves. Legendary martial techniques like Dragon Soars, Phoenix Dances and the cryptic Primordial Spirit Sword come within his grasp. Yet every fortune carries a shadow—danger and tribulation accompany each blessing. As fortuitous encounters multiply alongside formidable challenges, an unsettling realization emerges: could these events signal the ascension to Absolute Being status?