Reborn in the ancient era before the Fengshen War, Li Changshou becomes a humble cultivator determined to outlast the harsh Primordial Times. He avoids conflict and karma, plans every move with care, keeps his trump cards hidden, trains in escape techniques and refines poisonous pills. His plan is to stay safely tucked away in the mountains until he reaches immortality. That changes when his master brings home a young girl to become his junior sister. The show blends action, adventure, fantasy and romance.