kdrama or jdrama unexpected child

looking for a kdrama or jdrama where ML finds out he has a child he didn't know about

• Moon Lovers: Scarlet Heart Ryeo 
• Empress Ki - although it's debatable whether he's the ML or the SML
• Across the Ocean to See You - sort of, and in a very unusual way (also a C drama not K or J)

secret kdrama

lee jun kai cdrama

Wild Chives and Soy Bean Soup: 12 Years Reunion kdrama