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She posted photos of the boys on set with the message, "What do I do with these two... I don't dislike your couple photos. Why do Myung Soo and Young Do look so good together?"

The three stars, who are currently appearing on the SBS Wednesday-Thursday drama 'Heirs', were at the leadership camp set for the scene. 

Hyungsik looks adorable cuddled up under Kim Woo Bin's arm, but what about Lee Jong Suk?