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Beomgyu is a diligent and intelligent student known for his meticulous nature and strong principles. Struggling with asthma, he has a particularly strong aversion to smoking and anyone who indulges in the habit. His life is governed by routines and a desire to stay healthy, which makes him wary of people who might jeopardize his well-being.
Yeonjun, on the other hand, is the quintessential bad boy of their high school. With a reputation for being short-tempered and a visible smoking addiction, he terrifies most of his classmates. His rough exterior and rebellious attitude mask a deeper pain and a sense of isolation that few people ever get to see.
The collision of their worlds happens during a heated classroom debate about the impact of smoking. Beomgyu passionately argues against smoking, citing health statistics and personal anecdotes about the toll it takes on asthmatics like him. Yeonjun, infuriated by what he perceives as Beomgyu's self-righteousness, defends his right to make his own choices, even if they are destructive.
Their argument escalates, sparking a rivalry that neither can ignore. Beomgyu finds Yeonjun's attitude infuriating, while Yeonjun is equally annoyed by Beomgyu's holier-than-thou demeanor. Despite their differences, they are repeatedly thrown together by a series of school projects and mutual friends.
As they begrudgingly spend more time together, Beomgyu begins to see beyond Yeonjun's tough exterior. He discovers the reasons behind Yeonjun's smoking addiction and the struggles he faces at home. Conversely, Yeonjun learns about Beomgyu's vulnerabilities and the battles he fights daily due to his asthma.
Their mutual understanding grows, and the initial animosity starts to dissolve. Beomgyu's genuine concern for Yeonjun's health and Yeonjun's unexpected acts of kindness create a bond between them. They navigate their way through misunderstandings and prejudices, slowly moving from enemies to reluctant allies, and finally, to lovers.
