cranberryspice's Manga

Living the life of a scoundrel, Yoohan, who should be preparing for his college exam, threats and acts deceitful to get money from other people. After losing his family by the hands of a vengeful man, Yoohan starts feeling guilty and decided to work hard to atone for their death. As soon as he found out that his old roommate, Song Myeongshin, was involved in his brother's death, he too sought for revenge. And as if by fate, he meets a man whose first words to him were... "I WILL HELP YOU."

After the death of his beloved girlfriend, police officer Kyungjoon just wants to be left alone to water his house plants and catch criminals. But after a police investigation into a mysterious cult goes supernatural, Kyungjoon finds himself unwillingly caught up in a world of demons, succubi and monsters - and the worst of them all is a demon king calling himself "Lord Cain." It turns out that in order to survive, Cain needs mana that can only be accessed through a "door" inside Kyungjoon. The problem is... how is he planning to open that door?