Eighteen Years of Sign-Ins in Great Tang, Only to Discover It's the Journey to the West

Li Heng transmigrates to the Tang Dynasty and becomes the despised fifteenth son of Emperor Taizong, Li Shimin: Prince Shun.

His predecessor was dull-witted, and his mother's family was lowly. In this high-martial world, where the struggle for imperial power is fierce and the Turks are eyeing the empire hungrily, he should have been nothing more than an idle prince, living off the state until the end of his days.

Fortunately, he awakens the [Human Emperor Sign-In System]!