Shanghai, 1932. The main part of city occupied by Japanese troops. Ten Miles Square has become a small oasis surrounded by lonely darkness. Sun Timbo, the best cheongsam master in region, is hired to sew the kimono for the Japanese Governor's First Lady.
Juvenile Jiang Liuer has been living a peaceful and stable life. Until one day three demons broke into the village of Santun, and the heroine Caiying and his cousin Tianyun appeared to drop the magic. However, when the magic was about to fall, Master Zhishou suddenly appeared with Jiang Liuer, and put away the magic in one fell swoop.
In the beginning of times, humans and demons existed side by side in peace. Thousands of years later, the master of Youli clan violently launched a war to expel mankind. After hardships, the strange men and strangers expelled them to the depths of the earth and suppressed them with the Qianyuan Immortal Formation. The former head of the Ping You Division, Yi Shui Han, guides the half-human, half-Yuli to gather the Five Noble Ones to reorganize the division. After the human skin case, the emperor also ordered to reopen the Department of Peace and Harmony to find out the truth.
In a turbulent time in the Ming Dynasty, the Imperial Bodyguard solves humans' cases, while the Jinwu Guard takes charge of ghosts' and monsters' business. Eunuch Wei seizes great power and suppresses dissidents. Colluding with the monster Huo Feiyuan, he framed up Feng Tingzhang, the Director of the Grand Court. Zuo Changgeng, Feng's disciple, accidentally gets involved in the Jinwu Guard's monster hunting as he investigates the treasury's theft case. Though despising the Jinwu Guard, Zuo Changgeng has no choice but to ask the Jinwu Guard for help to save his master. Yi Shuihan is an upright half-human and half-monster member of the Jinwu Guard. Zuo and Yi work together and investigate in the humans' and monsters' worlds, before they gradually see through Eunuch Wei's intrigue. But the Jinwu Guard is framed up and then controlled by Eunuch Wei, and Yi and Zuo fall into Huo's trap. It turns out that Huo is the mastermind behind everything to destroy the Qianyuan Formation that ...
