Yup, these two may very well be the best thing in this drama!

'Come Back Mister' recently dropped some pictures from the set of the drama in which Rain and Oh Yeon Seo are fooling around as usual to play their quirky characters.  While both are dressed in all-white, Rain has a panda face mask on with a white band keeping his hair back while Oh Yeon Seo has mischievous expressions on and blows a kiss in a funny pose.

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Are these two your favorites or what?