K-Drama sets must be friendly places because so many stars stay in touch after the dramas end.

Park Ki Woong, who stars in the film "Mad, Bad, Sad," was recently interviewed by Newsen. He talked about his friendship with actors Kim Soo Hyun, his co-star in the film "Secretly Greatly," and Joo Won, his co-star in the drama "Bridal Mask."

"I still keep in touch with both of them," he said.

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