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Song Ji Hyo seems to be the "atmosphere maker" on set, making Choi Jin Hyuk adorably burst into laughter as they play around with the stethoscope. Their chemistry made even some Song Ji Hyo-Gary shippers question for a split-second whether to jump ship.

Also stay tuned for Brown Eyed Girls' Narsha and Kim Kang Hyun's cameos on 'Emergency Couple' this weekend at 8:40 PM KST!