for example i need romance 3 where she realizes her feelings after he leaves
I'm not sure if it fits your criteria exactly, but here's a few I've watched that are similar.
1)https://kisskh.at/3573-the-queen-of-sop
2)https://kisskh.at/10377-leh-nangfah
3)https://kisskh.at/24039-here-to-heart
4)https://kisskh.at/9849-discovery-of-romance