Unholy

Seven years ago, a dull-eyed girl saved a dying man. Now, years later, she plans to become a nun. But the man she saved—Cha Geon, the number two in a criminal organization—reappears before her. After searching for her for three years, confirming it for two, and observing her for another two, he has no intention of letting her go. While she tries to take refuge in God, he tries to take her away from Him, initiating a love that is anything but holy.

Original Webtoon:
R19: Naver Series, MrBlue, BookCube
R15: Naver Series, MrBlue, BookCube