45 Cho

After completing her university studies abroad, Siyeon returns home expecting a quiet transition back into everyday life. Instead, she discovers that her younger sister has enrolled her in an "Understanding Wine" course without her consent. The class is highly sought after due to its focus on wine tasting, which presents a significant problem for Siyeon: she is an absolute lightweight who cannot handle alcohol at all. Determined to fix her sister's well-intentioned mistake, Siyeon attends the course with the sole intention of dropping it and correcting the registration error. However, her straightforward plan takes an unexpected turn before she can even speak to the instructor. Amidst the gathering of students, she comes face-to-face with Eunha, a close friend from her high school days whom she had not anticipated seeing again. What was meant to be a brief administrative errand suddenly becomes far more complicated. Caught between her inability to drink, the popularity of the class, and the surprising reunion with someone from her past, Siyeon finds herself drawn into a situation she never planned for. Her simple attempt to escape the wine-tasting course may just lead her down an entirely different path.