So far I've seen mostly males in cdrama with a nosebleed, because they have the hots for the female lead. Some examples:
- Cinderella Chef
- Oh My Emperor
- Go Princess Go
Girls with a nosebleed tend to make long hours at work or school, I just don't remember the series in particular. The most impressive nosebleed I've seen occurs in Boys over Flowers. The moment Jan Di is hit by a ball thrown by her bullies at school is crucial for Gu Jun-pyo to fall in love with her.