Chen Changsheng obtains the Immortal Slumber System, which allows him to accumulate lifespan and attributes by sleeping. He waits for years to reunite with his old acquaintance Nianci, but when they meet again, everything has changed. From then on, he makes a coffin shop his home and travels the world as a funeral bearer. He survives wars and the rise and fall of immortal sects, encountering people such as Yixiu and Hu Meiniang and witnessing life's joys and sorrows. To find the missing Li Niansheng, he travels thousands of miles and becomes entangled in secret schemes involving imperial dynasties, the demon race, and an ancient bronze palace. Though he lacks exceptional talent for cultivation, endless years allow him to master funeral rites, formations, and medicine and see through the cruelty of the cultivation world. Along the way, he gathers and sends off the remains of old friends, ventures into forbidden lands of antiquity, and confronts the world's Dao patterns over an eternity of time, bearing one farewell after another throughout his endless immortality.