Remember 15

A mystery message from "Lyla", a school queen who committed suicide five years ago. It was sent to a former high school classmate, her senior, and her sister. Everyone was wondering how this message was sent. Since Lyla had died a long time ago…..
So the 12 of them returned to a deserted island. This is the place where Lyla died five years ago… to pay tribute to Lyla and find out who actually sent the message to prank….
But the closer it gets to the truth, the more they discover their cruel past. The dark secrets of the people they call "friends" until this deserted island…. has become a bloody arena…