He first revealed, "Nowadays people call me 'nation's father-in-law' because of my kids. My oldest daughter is actress Gong Seung Yeon and my youngest daughter is TWICE's Jungyeon. I can't help but smile when I look at the two."
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Yoo Chang Joon continued, "If my youngest one Jungyeon brought home a boyfriend, I don't think I could take it."
Uh-oh, Jungyeon's boyfriend better watch out for Papa Yoo!