Any drama where the male lead and female lead have bad blood, childhood enmity , hate each other, promotion or job jealousy towards each other something like that

and then later end up together 

You should check out :” Love in time“ and “ Love is sweet “ both are c-dramas 

Nueng Nai Suang - childhood enmity 

Secret is a good one. The guy hates the girl and does mean things to her which makes her hate him too. They eventually end up together.