The above picture isn’t a drama scene of Mary Stayed Out All Night but the behind the scene ones.
Moon Geun Young and Jang Geun Suk both in the same age (23 years old), quickly hit it off in the shooting set as they both also came as former child actor.
Moon’s opinion on Jang : Geun Suk is the mood maker in the filming set. He is a great friend from whom I can learn many things
Jang’s opinion on Moon : GeunYoung is very bright friend. She has a talent to make everybody happy. She always says greetings to all staffs first .
Source : The Star