Han Cheng transmigrated to a comprehensive xianxia (immortal chivalry) world and became a miscellaneous disciple in the Library Pavilion of Tianyong City. He thought he would live an ordinary and mediocre life forever, but unexpectedly, he activated a Check-in System—checking in at any location would earn him rewards.​ Checked in at the Library Pavilion of Tianyong City: Reward obtained - [Xisui Zaohua Dan (Marrow-Cleansing Creation Elixir)]​ Checked in at the Weihutang (Powerful Tiger Hall) of Tianyong City: Reward obtained - [Jiuzhuan Xuangong (Nine Revolutions Mystic Art)]​ Checked in at the Cangjiange (Sword Storage Pavilion) of Tianyong City: Reward obtained - [Zhuxian Jianzhen (Demon-Slaying Sword Formation)]​ Han Cheng acted cautiously and quietly checked in at Tianyong City for 300 years, eventually becoming unrivaled under heaven.​ Demon Lord Chonglou: "I have been unrivaled for many years—until Han Cheng appeared!"​ Evil Sword Immortal: "How could Han Cheng be this powerful? I can’t even block a single sword strike from him!"​ Zhao Ling’er: "Brother Han is a very talented person!"​ Feng Qingxue: "He is always so fascinating!"