Copy from novelupdates :
“Her biological Father appeared till later and recklessly picked her up and was a little unfriendly, but when Aika told him to come if he wanted to meet her, even though he was the emperor of an enemy country with whom he did not get along, he came running at once and was disappointed when Aika said that her uncle was important and wanted to go back. At the end she decided to embrace and accept her biological father as a good adult after seeing him speak honestly and respect her”
Their first meet on chapter 182. Still a long way to go for manhwa ver.

Aika's father is the emperor, isn't he? Same hair color, good friend of the late mom and fits the whole "her father is doing important things" her mom mentioned