On the latest episode of SBS's 'Running Man', Lee Kwang Soo couldn't overcome his male instincts and fell in love with Hong Soo Hyun, one of the guests for this week's episode along with actor Lee Bum Soo.

In one of the mini-games, Hong Soo Hyun was tasked with raising Kwang Soo's heart rate, and he immediately fell for her sneaky tactics of giving him her phone number and whispering in his ear (among other strategies).

Finally, in the race mission where the members were tasked with finding individual pieces of a puzzle, Kwang Soo ended up choosing love over winning by giving her the key that led to the final mission location. "I feel so weird. It's like we're the only ones here," he said nervously, betraying his inner emotions.

Unfortunately, his sacrifice was all for naught as the other team managed to assemble all of the pieces first, foiling Kwang Soo's attempt to secure true love.

Source: OSEN