Overview
Yeon-Seo (Yang Ha-Eun) majors in music at an university. She travels to Seoul to meet her older sister Jin-Seo. When she arrives at her sister's house, Yeon-Seo sees a large crowd and police there. Yeon-Seo learns that her sister was found dead. The police concluded that her death was a suicide. Yeon-Seo doubts her sister took her own life and begins to investigate. Detective Kim (Oh Gwang-Rok), impressed by Yeon-Seo's efforts, reexamines the case.
| Actor | Age then | Age now | |
|---|---|---|---|
 | 52 | 63 | |
 | - | - | |
 | 34 | 45 | |
| 59 | 70 | |
 | 68 | 78 | |
 | 32 | 43 |