Kim Jong Kook had to accept the fact that his relationship with Song Ji Hyo will remain as a secret for as long as the Monday Couple exists in Running Man. He's used to the love-line between Gary and Ji Hyo, knowing that it was only meant for the show. The Commander never doubt his woman, although there were several occasions when she had to demonstrate her affection towards her Monday Boyfriend.

But in one particular episode, the Sparta was challenged by the presence of a young man named Kim Jaejoong, who used to be Ji Hyo's co-star in a movie called "The Jackal Is Coming". While he had to be in a different team, Ji Hyo was paired up with Jaejoong as the hit men with a mission to eliminate all other Running Man members in the final mission. The Ace was very happy to reunite with her co-star, but that's not the case for Jong Kook who could sense the 'chemistry' between the Jackal Couple.

The story began way before the recording of the episode, revealing behind the scenes and the aftermath of the show. Can the SpartAce Couple survive the game of love? Or will this be the end of their secret relationship?