Kokufu Kyoudan - Manhwa

Choi Wol-ja, a black-clothed priestess who solves a series of bizarre murder cases in Gyeongseong, heads to Jeju Island, an island called "paradise." The thing is that in the waters around the island, ships keep disappearing. Strange incidents occur in which only men are sacrificed. 

This is the physical copy of the Kokufu Kyoudan manhwa.