The producers of the show confirmed that the two stars are the upcoming guests. It's also revealed that the filming with Park Seo Joon and Hyungsik will take place on November 25.
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Meanwhile, Hyungsik and Park Seo Joon are co-stars for the new KBS drama 'Hwarang', which has already completed filming.
You can watch the Hyungsik and Park Seo Joon combo on '1 Night 2 Days' as well as 'Hwarang' in December!