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During this week's episode, Kim Jong Kook had to face a punishment against Lee Kwang Soo after rolling a specific number with a pair of dice. As Lee Kwang Soo was getting ready to hit his fellow member's forehand with his finger, Kim Jong Kook stared intensely. Upon seeing this, Ji Suk Jin said, "Jong Kook ah, smile while doing this," which made everyone laugh and told him to lighten up.

Just before getting to the punishment, Lee Kwang Soo thought of all the time he felt mistreated by Kim Jong Kook and decided to lightly punch his forehand instead of flicking it with his finger. After the action, everyone started to panic including Lee Kwang Soo. As a revenge, Kim Jong Kook got to slap Lee Kwang Soo on the wrist which dealt him a greater pain.

Watch the funny clip above!