Oh Yeon Seo was seen smiling brightly thanks to 'husband' Lee Joon's original idea.

MBC's "We Got Married" episode aired on Saturday showed the 'husbands' Julien Kang, ZE:A's Kwang Hee, and MBALQ's Lee Joon together while texting their 'wives' Yoon Se Ah, SECRET's Sunhwa and Oh Yeon Seo.

Kwang Hee texted his wife Sunhwa in French "The star in my heart" making her happy. However Lee Joon texted Oh Yeon Seo seemingly carelessly "oo" to which Oh Yeon Seo immediately demanded, "What does this mean?"

Lee Joon texted back his explanation, "It means eung ae (the sound of a baby crying).. I am your baby," offering a very original remark that pleased Oh Yeon Seo that brought a bright smile to her face.

However Lee Joon was later seen confessing during the studio interview, "I was actually scared when Oh Yeon Seo texted me 'What does this mean?'" brining laughter on the set.