As reported in soompi the couple was seen on MBC documentary show titled 'Human Documentary' this week on January 8. They talked about their four years long marriage on the show.

On the show, Byul recalled her father who passed away in the year 2012 after he went through a ten years of complication from a medical accident. At that time the couple did not hold their wedding ceremony because of the death. But Byul and HaHa had registered for the marriage and as a result, HaHa being her legal husband stayed by Byul's side for all the three days of her father's funeral.

Byul also talked about her pregnancy last year in October, saying, "I have our second child. I wore my loosest clothing so I could hide it." She also added, "HaHa was so busy this time around. He barely came home. I had morning sickness, and I lay in bed crying by myself. I'm not holding a grudge against him. We have two children now, so he has to work more" as reported in allkpop.

During this interview, Haha also talked about Byul and said that he had witnessed all the hard work put by Byul to be a singer and for her family as well despite it was difficult. He said, "I thought, if I am to get married, it should be with this kind of person." Further talking about their marriage Byul said, "Although my father couldn't attend my wedding ceremony since we had registered our marriage, he knew that there was another man who would be there to protect me. He passed away knowing that. I'm thankful as a daughter. Because of that reason, I'll always live with a thankful heart to my husband."