Follow Chu Sangwoo, a dedicated student of computer science known for his rigid routines and precise habits, from his mundane days of fixed schedules and monotonous coffee choices to a fateful group project. When faced with lazy teammates, Sangwoo opts to exclude them from credit, inadvertently affecting the graduation plans of the affable senior Jang Jaeyoung. Choosing to avoid Jaeyoung's pleas for explanation, Sangwoo's world takes an unexpected turn when he seeks Jaeyoung's talents for his game development project. Discovering Jaeyoung's hidden fiery nature beneath his charming facade, Sangwoo finds himself at odds with the very person disrupting his well-ordered existence. As tensions rise and carefully laid plans unravel, Sangwoo must confront not just Jaeyoung's unpredictable disruptions but also the allure of his captivating smile, challenging the very foundations of Sangwoo's structured life.