Han Dong-hee

A cop must work with his mother, the "Mantis" - a female serial killer who murdered 5 men decades ago - when copycat killings emerge. He's hated her his whole life.

A young boy Hee-Joon is possessed by an evil spirit. Nun Yunia tries to save him, assisted by Nun Mikaela. Priest Paul attempts medical treatment, while Priest Andrew performs an exorcism to rid Hee-Joon of the spirit.

Kang Seong Jae is a soldier and gets transferred to the Gangrim Post, where First Sergeant Park Jae Yeong, First Lieutenant Cho Ye Rin and military cook Yun Dong Hyeon are stationed.