Eternal Teacher

Ji Sungjae meets a man at a bar and is seduced into a onenight stand with him. While having sex, he catches a glimpse of the scar on the man's arm and is reminded of the student that confessed to him when he used to teach high school. "Are you… Woo Youngwon?" Original Webtoon: MrBlue, Naver Series, Lezhin Official Translations: Japanese Lezhin combined Undeveloped Area and Eternal Teacher under the name "Private XX Lesson (프라이빗 XX 레슨)".