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 | Role |
|---|---|
 Oh Kwang-rokDetective Kim | Detective Kim |
 Cho Sang-guNa Seon-ho | Na Seon-ho |
 Ji Sung-wonOh Jin-seo | Oh Jin-seo |
| YYang Ha-EunOh Yeon-seo | Oh Yeon-seo |
 Kwon Byung-gilMr Son | Mr Son |
 Je Dong-hwaPizzeria Owner | Pizzeria Owner |
 Seo Woo-jinPizza Delivery Man Jung-woo | Pizza Delivery Man Jung-woo |