I Miss You Actress Jang Mi In Ae has today been summoned for questioning by police on charges of illegal drug abuse.
The 31-year-old, who stars alongside JYJ's Park Yoochun in the hit series, is being investigated for illegal use of sleep-inducing drug, propofol.
According to a report published by Korean newspaper Joongang Daily, prosecution also plan to summon actress Lee Seung Yeon.
Yeon, 44, is best known for her role in acclaimed film 3-Iron and TV drama The Great Seer.
A spokesman for the Seoul Central District Prosecutors Office confirm that they have secured evidence and testimonials up to three actresses, including Jang and Lee, have been using propofol illegally.
Sources at the authorities say the prosecution is now focused on finding out why Jang has supposedly been using the drug without surgery.
Suspicions first arose last month when investigators monitored seven Gangnam-based hospitals, including cosmetic surgeons' offices, from December 9-10, confiscating patient lists and medicine records.
During the investigation, it was revealed that Jang and Lee had allegedly continued to visit their hospitals for propofol injections.
A police source says: "More names are coming. The next person we are turning our attention to is a well-known television personality."