The novel created by Yusuke Kishi this is based on was adapted into a Japanese Getsuku television drama series titled The Locked Room Murders in 2012.
It is Xiao Shunyao's first time playing a villain.
Based on mystery novel "Kagi no Kakatta Heya" by Yusuke Kishi (published by Kadokawa Shoten, July 26, 2012)
The role of technical detective Yu Yibiao played by Guan Yu in the play is not in the original version. It is a new role after the adaptation.
Except for the first episode of the drama, which is an adaptation in tribute to the original work, the rest of the cases are all local creations that suit the national appetite.