Killing 7

In the reasoning network there are seven members who share the common interest of reasoning One day they decided to go snorkeling for vacation Unfortunately they have an accident and drifted to a desert island On the island everyones cell phones signals are gone so they are forced to stay for seven days until the next ship comes The first night six of them have received the missing partners slaughtered video message at 010 midnight The coming week one person is missing night by night Can some of them survive from the desert island Or all of them must die there Who is the murder Killing 7 will have a surprise ending for the audience