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A story in which young people who share a world of their own become each other's confidants and the light that illuminates their lives. Yeon Tae Seo is a subway driver with a sharp perspective on the world. Tae Seo is an independent person who lives faithfully to the present, focusing on "just today" rather than the future or dreams. While successfully achieving his longed-for independence and settling down, he encounters Mo Eun A, his first love from when he was nineteen, which gently stirs up ripples in his daily life. Mo Eun A is a former hotelier turned Seoul lodging manager brimming with passion, depth, and lovable charm. Setting goals for herself—where, with whom, what, and how—she experiences small triumphs and major setbacks until she reunites with her first love, Yeon Tae Seo.
Eun-a makes a decision that forces her and Tae-seo apart again. Soon after, a major misunderstanding leaves him heartbroken and betrayed.
Despite help from Bae Seong-chan, Eun-a struggles to find her place in the world. Tae-seo deals with unease as he confronts his family's health issues.
Eun-a and Tae-seo slowly settle back into their rekindled rhythm. Meanwhile, they both navigate challenging personal and family issues.
After running into Eun-a again, Tae-seo looks after her out of concern — but unresolved feelings keep things awkward between them.
Ten years later, Tae-seo and Eun-a live completely different lives. One day, they cross paths again by chance — stirring old feelings.
From school to relationships and work, Tae-seo struggles to juggle his responsibilities. Meanwhile, Eun-a's career begins to reshape her life.
Tae-seo and Eun-a's relationship continues to blossom, progressing from romance to intimacy. But adulthood soon separates them, testing their connection.
Yeon Tae-seo heads to the countryside with his younger brother to stay with their grandparents. There, he meets Mo Eun-a and the two form a special bond.