Returning home to his parents' house, a young man looked forward to seeing his family again after a long time. As he walked carrying his travel bag, his eyes were suddenly drawn to his sister-in-law, who was cleaning nearby—someone he hadn't known his older brother had married. For him, this first encounter with his sister-in-law was utterly shocking. After happily reuniting with his brother, the young man spent pleasant days with his family, but one night he accidentally witnessed his brother and sister-in-law secretly making love in the bedroom. Peering through a crack in the sliding door, he felt his heart twist with inner turmoil, yet found himself irresistibly captivated by the allure of his brother's wife. Unable to act on his feelings, he could only carry this secret longing within him until the day he had to return home.