Having seen his wedding photos and then seeing him getting married earlier this year, it was announced on 4th November that Yoo Se Yun is now a father! In a press release by his management, "Yoo Se Yun's wife has given birth to a healthy baby at 4.30am on the 4th at a local medical facilitiy. Her delivery came 10 days earlier than previously forecasted. The baby boy weighs in at a healthy 3kg. The name for the baby hasn't been decided yet but they have given it a milk name of "Haengbok" (happiness)." Yoo Se Yun said, "I am very happy and blissful. I really want to thank my wife who have suffered in these 10 months and my baby son who has come into this world healthily. I will take on more responsibility for them in future."