Sung Hanbin and Sung Somi are twin siblings. Hanbin lost his sister when he was 10 yrs old . she has been missing for 11 yrs now . Hanbin and Somi's childhood best friend Zhanghao returned from China after 11 yrs. what happens when the two meet ? will they be able to find somi alive ? STORY CONTAINS MATURE THEMES AND MENTION OF SUICIDE AND MURDER !