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On the upcoming broadcast of KBS 2TV's 'Superman is Back', Suh Un and Suh Joon visited their grandparents in honor of Parents' Day in Korea. Their grandma was so happy to see the twins finally walking that she rewarded them with yogurt and the boys couldn't get enough of its deliciousness, giving Choo Sarang, who is known for her 'eating broadcasts', a run for her money, or her yogurt, we should say.

Stay tuned for their adorable moments on 'Superman is Back' on the 25th!