The male protagonist is an old emperor
The heroine is an underappreciated daughter of a distinguished noble. When she was a child, she was selected into the palace as a princess's companion because of her outstanding performance. She was cared for by the old emperor in the palace for many years, and she was full of admiration for the old emperor.
After growing up, she was pursued by the old emperor. The heroine was a little resistant but also a little moved.
It's probably such a story, written since the heroine was a child
Reading guide:
1. The old emperor has a harem, a prince and a princess.
2. The age difference is 16, and the father is the male protagonist.
Concept: Love is complicated