Devil King Woo seeks Seon-mi's help in dealing with a troublesome prince who refuses to return home until he finds a runaway mermaid.

Cast: Lee Seung-gi, Seung-Won Cha, Yeon-Seo Oh, Hong-ki Lee, Gwang Jang, El Lee, Daniel Joey Albright, Sung Hyuk, Seong-oh Kim, Michael K. Lee, Se-yeong Lee, Jong-ho Song, Ji-ru Sung, Bo-ra Yoon