Lights, camera, action: the latest episode of SBS's 'Running Man' turned itself into a drama set, shooting a three-part Korean drama loaded with reversals, bloodline feuds, and more with guests Go Ara and Lee Yeon Hee.

Although the drama began happily enough - with the cast and guests divided into couples and seeking to win the approval of their father, the CEO of a major corporation - it eventually came to light that two within their midst were, in fact, blood relatives!

With victory, and the company's inheritance, coming to the one who solved the mystery of the family heritage, the crew hustled to find the clues relating to the bloodline and piece together the truth behind the siblings.

The final victor was Go Ara, who ripped the nametag of the female sibling, Lee Yeon Hee, who had herself ripped off the name tag of her own brother, Yoo Jae Suk, earlier in the race - giving this drama a decidedly tragic element, as well.

Check out the full episode below!