On the July 29th installment of tvN's 'Taxi', S.E.S' Shoo appeared with her husband Lim Hyo Sung, their son Lim Yoo, and their twin daughters Ra Hee and Ra Yool.  

MC Oh Man Suk asked Shoo if she wanted a fourth child to which Shoo responded without hesitation, "I think I could do it. I think I'm addicted. How many times would you experience the pain of natural childbirth in your life? I want to try enduring that pain again."

SEE ALSO: Late singer Wheesung used the alias 'Shin Jin Seo' to continue his musical career

Their son Lim Yoo was then asked whether he liked Ra Hee or Ra Yool better. He shouted, "Ra Yool! I like her better because of her face." Everybody couldn't help but laugh that he happened to choose the face as the reason when the girls were twins. It was even difficult for their father to tell his two daughters apart. He was asked by the MCs to tell the two apart, but he wasn't able to in one go. 

After hugging each of them, he said, "Seeing how she's crying, this child is Ra Hee. She always cries when I hug her."

Did you watch Shoo's twins on 'Superman is Back'?