Chi-ho, a genius confectionery researcher who has developed addictive flavors, experiences a sweet change when he meets Il-yeong, a call center worker at a loan screening company who thinks optimistically about everything, and goes through sweet changes.

Swimming instructor, Young-eun is a single mom raising her 7-year-old daughter, So-hyun. However, a series of tragic events happens as So-hyun's puppy falls from the apartment and dies, and So-hyun bullies other kids in school. Despite her mom's earnest efforts to address So-hyun's mental disorder, her peculiar behavior persists. Twenty years later, Min, who works in handling unclaimed deaths, meets a new colleague, Hae-young, and they form a close bond. However, as Hae-young warmly integrates herself into Min's life, Min begins to feel uncomfortable and suspicious about her intentions.

One day, a 10-year-old child finds another child isolated from the world. The two children meet at 2:15 PM, allowed only 15 minutes together, during which they start to see that warmth can break down the barriers between people.

In a rural village, a strange phenomenon arises in which people are driven to kill the one they love most. Mi-jo, the village's most powerful figure, steps forward in the name of the greater good. But as the truth is revealed, she comes face-to-face with her own desires—and unveils her bloodstained nature.