Chu Xuan transmigrated into a Xuanhuan world and became the deposed crown prince of the Great Xia Dynasty. His journey begins in the Heavenly Prison, but he awakens a check-in system. By checking in at special locations, he gains incredible rewards. "Ding! Check-in successful, obtained the Ice Saint Body!" "Ding! Check-in successful, obtained the Nine Dragons Pulling a Coffin!" "Ding! Check-in successful, obtained the Dragon Elephant Prison-Subduing Fist!" Years later, when Chu Xuan leaves the Heavenly Prison, he discovers he has become invincible!