In a mysterious center, six passionate students and their parents gather to receive methylphenidate, a clinically approved drug known as the ""study shot."" which enhances blood flow to the brain to improve learning effectiveness. While the children, who have received the study shot, are locked in and studying, the parents practice administering injections inside. As the test results are announced, a tense atmosphere develops among the students, resulting in an incident that Kyung-min stabs Ye-jun in the neck with a pen. Meanwhile, subtle infidelities and conflicts begin to ignite among the parents.