22-Year-old Lin Wanzhao, in order to find her missing sister Lin Chenyue, entered the secretive Qingyuan Sanatorium, but unexpectedly stepped into the world of "Night Watch" - what she fought here was not ordinary patients, but "folklore reverberations" that fell into madness due to being forgotten and swallowed up emotional memories.
On her first day of employment, she found a traditional Chinese medicine sachet in her sister's old locker. The moment she touched it, the afterimage of the Nuo mask flashed across her face, and her talent for empathy and touch was awakened. From then on, she worked side by side with her steady mechanic partner Chen Shouzhuo, and followed Zhou Yinlu, a mentor who had experienced the fire, and used a combination of traditional Chinese and Western medicine methods such as "cinnabar calming needles" and "glutinous rice moxibustion" to solve strange incidents: Grandma Chen who recited the Nuo opera formula of "wear red robe, ride a black horse", the out-of-control person who imitated Nuo dance and twisted, Nuo masks and witch symbols that were spliced to reveal the "emblem of chaos"...
The gentle and elegant Dean Gu Yuan hides a twisted ambition - because he was unable to save his loved ones, he tried to control the "reverberation" to "protect the world". When the core contamination body (half peeled Nuo noodles, half burnt witch bones) arrived, the trapped Chenyue had already used her own ability to connect to the benign memories in the "reverberation", and the sisters cooperated internally and externally, finally allowing her to "sleep peacefully".
