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Lee Hwi Jae, his twins, and their grandfather are going to Busan on the upcoming episode. During their trip to the museum, the twins couldn't be any more excited as they looked at the interesting display and happily said, "Daddy! Daddy!"

Every time Suh Joon took a step, his pants fell down more and more as he ran after Suh Un, being able to do a catwalk even with his pants down. Seeing this, Lee Hwi Jae replied, "Suh Joon ah, why did your pants fall down so much?" Then Suh Joon lifted up his shirt to show off his cute belly, showing a carefree side to him.

Stay tuned for their Busan adventure this Sunday at 4:50 PM KST!