"At Eighteen" (also known as "Moment at Eighteen") is a South Korean drama series that follows the lives of 18-year-old students navigating the complexities of high school, love, friendship, and personal growth. The story centers around Choi Joon-woo, a loner who transfers to a new school and encounters Yoo Soo-bin, a top student with dreams of independence, and Ma Whi-young, a seemingly perfect student with inner insecurities. The series explores themes of loneliness, first love, peer pressure, and the challenges of finding one's place during the pivotal year of eighteen.