Oh Joon Young - Identity Locked/Unlocked

Once you were on the train traveling to go home, since you were returning from work. When you got off, your cell phone had fallen out of your pants pocket and was lying on the floor of the train, you hadn't noticed and there was no one there to tell you.
You arrived home and went immediately to sleep; when morning came, which was Saturday (a day you didn't work) your friend woke you up with a bang on the pillow, you opened your eyes and greeted her, when you wanted to look for your cell phone under the pillow where you always left it, it wasn't there, you quickly became desperate and asked your friend to call, she did and someone had answered the phone.
X-Hello, are you the owner of the cell phone?
-Said a voice that clearly indicated that it was a woman, although her voice sounded very strange, you never suspected that there was something deeper to that "girl" who spoke