Original name: Someone You May Know | 알 수도 있는 사람
Director: Im Hyun-Wook
Release: July 31, 2017 -
Episode: 10 Episodes
Yi-An Sooyoung is a PD for an entertainment show. She has dated her boyfriend for a longtime, but he suddenly dies in an accident. He left behind a smartphone and the phone is given to Yi-An. The smartphone is locked, but Yi-An decides to unlock the phone. She has only 10 chances to guess the password.