Dramas where FL first falls in love with someone else?

I want dramas, where the Female Lead first falls in love with someone else/is in a relationship with him. 

I don´t care if he is just some support role or a important Second Lead. The most important thing is, that this guy is a bad person! He has to be a jerk, a player, an abusive person or he should be just not likeable. He should be NOT pitiful and a really good person. I don´t want to feel bad for him. when the Female Lead falls in love with the Male Lead later on. The best would be, that after the Female Lead slowly falls in love with the Male Lead, the second guy gets jealous and tries to get her back.

Other important things:

• Male Lead falls in love first
• No weak/dumb Female Lead. She should be at least a little bit independent
• Happy Ending
• No love at first sign
• Not too fast pasted romance  
• Jealous moments from Male Lead 

Bonuses:

• Not too many episodes
• Young characters/Young cast (Around 18 to 38)
• No big Age Gap especially Older Woman/Younger Man  
• Oblivious/clueless Female Lead when it comes to the love from the Male Lead
• Bickering couple

Examples:

• Fight For My Way
• Birth of Beauty
• Wednesday 3:30 P.M.
• Suspicious Partner (She falls first but I just mean that kind of a constellation that her boyfriend cheated on her but still got jealous when she got near the ML)
• Weightlifting Fairy Kim Bok Joo (SL is not a bad person but he doesn´t love her back and something like that is alright too)

Any country is welcome!

 AH :

https://mydramalist.com/list/61GEevj3 Virtually all of the dramas in this list fit. Several of the dramas you mentioned as examples are included. 

Thank you so much!