Datang signed in for 18 years and suddenly discovered that it was Journey to the West

Li Heng traveled through the Tang Dynasty and became the prince who was neglected by Li Shimin, but unexpectedly awakened the sign-in system.
[Successful sign-in at Hanyuan Palace!Obtained "Sword of the Son of Heaven"]
[Successful signing in at Zichen Palace!Obtained "Huangji Shocking Fist"]
[Successful sign-in at Human Emperor's Palace!Obtain the "Human Emperor Jade Book"]
……
Li Heng originally thought that he had come to Gaowu Datang, and he just wanted to sign in low-key and become stronger silently.
Until one day, Avalokitesvara Bodhisattva stood on the city of Chang'an, saying that the world is filthy and strife, and that he wants to select scriptures to go to the West to obtain the scriptures and cross the Tang Dynasty.
Only then did Li Heng know that there are seven sages from the heavens, gods and Buddhas all over the sky, and great monsters in the world!
This is the world of Journey to the West, Nanbuzhou, where the human race is as humble as ants, the emperor is like grass, and the emperors are all under the Buddha!