Not long after his break up with T-ara’s Jiyeon, it was confirmed that Lee Dong-gun was dating his co-star Jo Yoon Hee from The Gentlemen of Wolgyesu Tailor Shop. They were the main leads, and acted as couple in the drama. Their on-screen relationship had become a real off-screen relationship. On May 2, 2017, Lee Dong-gun announced that they had registered their marriage and were expecting their first child.
The couple were originally featured in Newlywed Diary 2. However, due to Jo Yoon-hee’s health suddenly affected by the preparation of the show, the couple decided to step down from the show. The couple were focusing on Jo Yoon-hee’s health as she was pregnant with their first child.
The couple held their wedding ceremony on September 29, 2017 in Seoul. The wedding ceremony was private and small with attendance of only their family members and close friends. On December 14, 2017, Jo Yoon-hee gave birth to a baby girl at a hospital in Seoul.