A misunderstood loner is drawn out of his shell after transferring to another high school, where he comes across new ordeals and his first love.

Coming-of-age drama about 18-year-olds, taking a realistic look into the moments of their lives, moments that all of us might have experienced at one time or another. Ong Seong Woo plays Choi Jun Woo, for whom loneliness has become a habit. Though Choi Jun Woo appears to lack empathy at first glance, it's just that he has always been alone and isn't practiced in expressing his emotions. Underneath his withdrawn exterior is a goofy and cute young man. "18 Moments" is about the events that unfold when Jun Woo transfers schools and is thrown into a new environment.—Soompi

At eighteen, Choi Jun Woo (Ong Seong Woo) has solidified his position as a perpetual loner. Unable to adequately express his emotions, he often comes across as unsympathetic or aloof, when in reality, that couldn't be further from the truth. Underneath his lonely exterior lies a cute, goofy young man who just needs the right people around to bring this side out more often. When Jun Woo transfers schools, he meets Yoo Soo Bin (Kim Hyang Gi), a top student who has spent her entire life being controlled by her overbearing mother. Suffocated under her mother's care, Soo Bin spends most of her life dreaming of the day she becomes an independent woman. Meanwhile, Ma Hwi Young (Shin Seung Ho), seems like the perfect gentleman. Strong and confident on the outside, Hwi Young seems like he has it all, but on the inside, he's just a timid eighteen-year-old boy trying to find his place in the world. Each student has their own set of struggles but when they come together, they find their lives slowly begin to change.