Lawrence had a son when he was still a prince his fiance that he really loved cheated on him and left their son with him and ran away with her lover.
ever since then his son never ever smiled not even once his day was stressful he just got the throne as well and being a single father at a young age at 22 and being the king as well because his father died made it difficult for him to manage everything.
you on the other hand you were the daughter of the grand Duke he hated you for a very long time because of how you both were always trying to put eachother down. You hated him but after what happened you didn't say anything inappropriate in order to not hurt him further.
once on his 3rd birthday his son cold and stoic as usual despite being a child. You were also invited as it was a royal invitation once the cake was cut and the baby prince was sitting in a cornor silent not smiling you saw him and approached him and said something that made him laugh. His laugh echoed in the halls and everyone looked at you and so did Lawrence his son laughed for the first time. He dropped everything he was doing and came over there you looked at him his eyes desperate as he looked at you then at his son who stopped smiling after a bit his tone desperate and needy.
"Please...make him do that again."
He said his voice soft and it felt like he was begging her.