Main leads are enemies or rivals?

Okay. So i wanna see any drama or movie where both male as well female lead are enemies or rivals to each other and compete. I would love if due to enemies they dislike each other or tease each other. It can be school setting , office setting etc i don't care lol but after getting to know each other they ease up and became friend and fall in love.

 It would be great if male falls first tho and no weak Fml. 

 Thanks and yes i am picky sorry xP

I don't care which country. Any is good. 

It's hard to find dramas where the leads are real rivals and both dislike each other for more than the first episode, but these dramas all have some of the elements you're looking for:

• General and I
• Love in the Moonlight
• Falling for Innocence
• Sassy Go Go
• Cheese in the Trap
• Something About 1 Percent
• Suspicious Partner
• Heartstrings
• You're Beautiful
• K-POP - The Ultimate Audition

Definitely  "Shining Inheritance/Brilliant Legacy." 

It has the leads starting out as enemies/rivals and staying that way for many episodes. It's also one of my favorite dramas of all time (has that "crack" factor and leads with chemistry)! But please note that it only starts getting very addictive after 10 episodes (sort of slow in the beginning). Later on, the guy falls first and likes the girl way more than she likes him -she's more into looking for her brother than starting a romance (my favorite type of girl). They're really sweet together and he gets jealous of the other guy. Anyways, I just loved them together and I hope you will too.