During the 'Superman is Back' this week, CNBLUE's Yonghwa made a surprise guest appearance.

Lee Hwi Jae's two sons were eating an ice cream at a convenience store in front of their house when they met Yonghwa coincidentally. At first, one of the sons (Seo Joon) was wary of Yonghwa as they never met previously. Because Yonghwa could sense this, he showed a photo of himself and Seo Joon's father together. Afterward, Yonghwa called Lee Hwi Jae to display their close relationship.

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Yonghwa offered to walk the kids back to the house and greet Lee Hwi Jae. Even though Lee Hwi Jae said there was no need to go to such a trouble, Yonghwa still took the kids back. Once, he got to the house he played with the kids and even helped Lee Hwi Jae feed his kids. It appears as that the kids took a liking to Yonghwa quickly and they even gave him a toy as a parting gift when he told them he had to leave.

Also during the episode, Lee Hwi Jae mentioned which of Yonghwa's song he held the dearest to his heart which was "Can't Stop". After saying this, Yonghwa proceeded to sing it to the kids.