Courier Shangguan Yue accidentally breaks an antique snuff bottle, only to be sucked inside and transmigrate to the Great Wu Empire. Starving and freezing, she is rescued by an elderly couple, but then discovers that the identical snuff bottle her adoptive father gave her can connect to the modern world!
She becomes the leader of a mountain stronghold, tames bandit chiefs, recruits wolf troops, and takes her father's place in the army, repeatedly earning great merit while disguised as a man. She rescues a female general, trains iron cavalry, and defeats a coalition army, putting modern knowledge to brilliant use on the ancient battlefield. Bear spray helps her capture a bandit chief, drones give her a view of enemy camps, ration bars steady her troops, and a fast-acting heart-rescue pill even revives the empress! Rising step by step from the mistress of a mountain stronghold to Prince of Zhenbei, Shangguan Yue must navigate both tangled romances and the danger of deceiving the emperor.
When the secrets of the snuff bottle meet court conspiracies, and modern thinking collides with ancient schemes, can this courier girl stay true to herself in a world full of peril and uncover the astonishing mystery behind her transmigration?