A medical student who pulled all-nighters to cultivate immortality suddenly collapses and wakes up in the early Tang Dynasty! This isn't the Tang Dynasty from history books, nor the mythical Tang Dynasty from Journey to the West. An unexpected trip to the Rat Kingdom unveils the secrets of the path to immortality. Li Dan Dao embarks on a journey to become a Daoist doctor, aiming for a place in the Tang Dynasty's immortal register. Starting by inheriting a small pharmacy, becoming an immortal is no longer a dream. What? Your name is Lü Yan? What? You're Zhongli Quan? How can the Eight Immortals of Shangdong be complete without me, Li Dan Dao? Famous courtesan Bai Mudan! Ghost-eating scholar Zhong Kui! Qinglian Sword Immortal Li Bai! The flamboyant figures of the Tang Dynasty... how can I be missing? Bring on the wine! Bring on the sword! Bring on the poetry! You ladies...