Sufficient Motivation summary: 'Do-kyung' is an idol-turned-actor. He’s the type of guy who, if hit once, pays it back double. He decides to return to university after being provoked by Cheol-won—his co-worker and bitter rival—who looks down on him and draws a line between them just because Do-kyung hasn't gotten his degree yet. Meanwhile... "I'm never dealing with a guy who wears makeup ever again." 'Jae-ni' is a photography major and a hardcore fan of the actor Cheol-won. She was the one who took a legendary photo of him that broke the internet, but due to an unsavory incident, she ends up leaving the fandom for good. Feeling empty, she decides to return to school to get her life back on track. And just like that, on the exact same day, Pyeonghwa University's two legendary returning students make their comeback. Do-kyung and Jae-ni seem to have no connection to each other, yet somehow they do. After meeting in a class, their lives start tangling together in the most unexpected of ways...