Since childhood, Hasu has had a long-standing crush on her close friend Saetbyeol. Even though it’s gone on for a long time, Hasu is content—just like always—to stay in her place as Saetbyeol’s best friend. Believing she knows everything about Saetbyeol, Hasu also knows that whenever Saetbyeol gets confessed to, she always turns them down by saying she already likes someone—and Hasu has never thought much of it. But one afternoon after school, Hasu sees Saetbyeol face-to-face with a boy from their class, and Hasu’s heart fills with endless anxiety.