At Eighteen[2] (Korean: 열여덟의 순간) is a 2019 South Korean television series starring Ong Seong-wu, Kim Hyang-gi, Shin Seung-ho, and Kang Ki-young.

The series marks Ong's first official lead role.

[1][3] At Eighteen follows the story of eighteen-year-old Choi Joon-woo (Ong Seong-wu), whose teenage life has been molded by his meager family life and the conflicts he faced in school.

Not only Joon-woo, but his fellow immature and inexperienced eighteen-year-olds, too, will have conflicts and whirlwinds of emotions and face the prejudices of a world shaped by the adults around them.

For all they know, the memories of their nineteenth year of life might be the sweetest, the most precious, and the most unforgettable.