Twenty Years of Signing in to the Heavenly Prison, I am Invincible

Chu Xuan traveled through a fantasy world and became the deposed crown prince of the Great Xia Dynasty.

I was thrown into the sky prison at the beginning, but fortunately I awakened to the sign-in system.

As long as he signs in at a special location, he can get rich rewards.

"Ding, sign-in successful, obtain the Holy Ice Body!"

"Ding, check-in successful, get the Nine Dragons Pulling Coffin!"

"Ding, check-in successful, obtain the Dragon Elephant Prison-Suppressing Power!"

Many years later, when Chu Xuan walked out of the prison, he found that he was invincible in the world!