Nicknamed the "school for future criminals," Yuseong Technical High School isn't exactly the ideal place to study. A rarity among his peers, Ga-min is a student with just one goal: to get into university. At a school where it's every man for himself, he is rejected from countless study groups before he decides to form his own. Will he be able to defeat the odds and achieve his dreams?
Kwon Do-hun is an expert sniper and a secret agent working for the National Intelligence Service. To conceal his true identity, he lives a double life as a regular trading company employee, keeping even his wife Kang Yu-ra in the dark. Though he is occupied with his work, Do-hun cherishes his wife deeply. Meanwhile, Yu-ra, a dedicated homemaker, harbors a secret. Their tranquil existence is thrown into turmoil when Jo Tae-gu emerges, posing a threat to their carefully crafted façade.