The Australian producer (David No) was also So Ji-Seob's stunt double and played the Assassin in the first episode.
Lee Dong-Geon, Lee Jung-Jae was considered for role of Cha Mu-Hyeok but declined.
Kim Hee-Seon was considered for role of Song Eun-Chae but declined.
The rainbow knitwear and boots worn by Lim Soo-Jung in the play were so popular with women at the time that they were sold out.
It is also the motif of the name of the insertion song "M.I.S.A" of the online game Granado Espada.