The exams concluded but no one was permitted to leave yet as the grading was being carried out by the supervisors of the exams and this would take approximately a week.
They had a week in Dubai to fully enjoy themselves, their phones relinquished back to them to allow them to leave a sort of blueprint that they were here as it would be strange if they vanished without a trace for that long.
They did not need to give baseless excuses to their friends or loved ones as to why they seemingly vanished from the face of the earth because the news reported that there were communication errors in some parts of Dubai. This, of course, was not true but their influence made it possible to manipulate the news to this degree.
The first thing Byung did when he got his phone was open up his Line App and send a picture of his hotel room to both Cho and Kwan with the caption.