Even though Wheesung had originally denied being investigated for propofol abuse, it turns out that he's been investigated twice.

The army prosecutor stated, "We recently summoned Wheesung twice for illegally administering propofol."

According to the police, Wheesung is currently being investigated for regularly administering propofol at the clinics of dermatologists and psychologists from 2011 to the beginning of 2013. 

Wheesung's agency had said, "All the reps of the clinics that Wheesung visited testified that he did not illegally administer propofol, but that he had been administered the drug for its original as an anesthetic... Various clinics and medical professionals have submitted their official opinions about how in the case of Wheesung's procedures, propofol is often used. Even the prosecution has asked us to gather statements like this."

The army prosecutors are planning to summon Wheesung again one or two more times, and they are also investigating his friends and family. Additionally, they will be investigating if he was given special treatment because it was discovered that he was given break time from the army an incredible number of times.

Source: Sports Seoul