Need a drama where male lead is confused between two girls

I think something's wrong with me! I am fed up with dropping every other drama I start to watch. It just never stops!

So basically, I'm looking for a drama where I want so many things.

First, female lead falls in love with male lead first.

Second, male lead should be in love with someone else already!

Third, female lead can be a really close friend of male lead and he never thinks of her as someone important, like she is so constant in his life, while he keeps on courting his first love.

Female lead should be a good person by heart, not too annoying.

Male lead should be decent, not freebie in his life, at least should have a decent job!

Dramas that I loved watching, that were of my taste-

Secret life of my Secretary (He really treats her as a minion but he also cares for her a lot.)

Wedding(Old drama but I found it really suited my taste)

Find me in your memory(Ongoing, but I can be sure I can never get bored of waiting around for its episodes)

My name is Kim Sam soon(This Drama was everything I ever wanted! I want another like this one!)

Another Oh Yeong (If you can suggest me another one like this, I will go dance over moon!)

Our times(this movie is such a tearjerker for unrequited love)

She was Pretty(close to my taste, Comedy makes it kinda easier to watch unrequited love)

Marriage not dating(close to my taste, still enjoyed it a lot!)

Warm and Cozy (I really wanted to like this drama, it had all the elments i liked in drama, but the male lead turned it off for me. He was such a jerk, nobody, and doesn't even take life seriously. Everything seemed like a joke to him, I hate that type of characters!

Beauty Inside(2nd Couple)

Long Vacation(Japanese drama)

Love Generation(Japanese)

Encore(Chinese)

Please, suggest me something which I won't drop, can't drop no matter how much I try, cause this time I really want to be loyal to a series.

Also, I can't name all of the dramas I watched since its been 5 years of me being an kdrama addict so I know it would be hard to recommend me some good dramas!

But still, try please! ?

Pasta is a really good drama. Just stay through the first episode and you'll get hooked.

Ex-Girlfriend Club

Thirty But Seventeen doesn't match FL falls in love first & ML in love with someone else, but still a great one

or try You Drive Me Crazy it is a very short one

 Little Cherry:

First, female lead falls in love with male lead first.

Second, male lead should be in love with someone else already!

Third, female lead can be a really close friend of male lead and he never thinks of her as someone important, like she is so constant in his life, while he keeps on courting his first love.

Female lead should be a good person by heart, not too annoying.

Male lead should be decent, not freebie in his life, at least should have a decent job!

I'd say none of these fit exactly, but they're all pretty close:

• Itaewon Class - I haven't finished this drama yet, but I think it fits most of your criteria. The FL isn't an angel, but she's generally decent and her feelings for the ML motivate her to try hard to be a good person. The ML also doesn't see her as unimportant, he just doesn't see her as a potential romantic interest because of his first love and possibly because she is several years younger than he is. The FL definitely falls first, the ML is in love with someone else already, the ML and FL work together and become close, the ML has a decent job (he is the owner / CEO of a pub which he intends to incorporate and franchise) and is a very good, principled person. 
• Wednesday 3:30 PM - The ML is in love with someone else and thinks of the FL as his mum's best friend's daughter at first. They're sort of like family, but become friends in their own right while also developing feelings for each other as they get closer to one another. The FL is a bit hung up on her ex, but not exactly in love with him. They're decent people and the ML's job is looking after / running a coffee shop while his friend is out of town. The ML helps the FL make her ex jealous.
• Gu Family Book - The ML is in love with someone else and thinks the FL is a boy for a while. Both the ML and FL are good people. The ML doesn't really have a job (he's young and it's a fantasy / historical drama) but he has unique abilities.
• Coffee Prince - The ML is in love with someone else and sees the FL as a younger brother (and thinks she's a boy). The ML and FL are both good people and the ML is a chaebol who is tasked with running a coffee shop before he is allowed to inherit his family's food business.

You might also consider trying:

• W Two Worlds - The SFL is set up as the character who is supposed to be the ML's love interest in the Manhwa, but as things play out he isn't really confused between her and the FL, it's more that the ML is so focused on the answers that the FL can give him that he doesn't fall for her / see her as a romantic interest right away. He always has a feeling that the FL is important (and not a person with bad intentions) from the beginning though. Both leads are good people. The ML won an olympic gold medal and then founded a company / TV show that helps solve impossible criminal cases because he was falsely accused of committing a crime. He is very well off financially.

Rich Man, Poor Woman both Japanese and Korean remake 

I suggest Wok of love