Cultivation Level 9999, Please Stop Being Stubborn.

Su Yunyi, who traveled through time and became the prince of a demon country, fell in love with an enemy princess and was imprisoned in a prison where he will never be able to stand up again! However, Su Yunyi accidentally activated the check-in system and started checking in every day to become stronger! "Ding! Congratulations to the host for successfully signing in, gaining an exquisite physique, and being invulnerable to all poisons..." "Ding! Congratulations to the host for successfully signing in and obtaining the Immortal Killing Sword Formation..." So, after leaving the quarantine, Su Yunyi created a myth and legend!