Rio married an older man and made a fresh start with a new family. Her husband had a son from a previous marriage, but over time, any tension vanished, and she believed they had built a comfortable, sibling-like relationship where they could talk about anything. However, within her stepson, feelings began to sprout, seeing Rio not as "family," but as "a woman." With this delicate distance between them, Rio and her stepson end up spending a week entirely alone together...
