Female lead unintentionally leads on the male lead while being in love with the second male lead

She doesn't realize she's giving him false hope until he tries to act and she rejects him. She then guilty for leading him on. Eventually she realizes she does love him and pursues him. 

Cruel romance (c-drama)

The queen of SOP (I think this drama is exactly how you explain. The thing is, it's more about the main Female Lead and Office stuff than about romance.)

 In time with you 

 ShotaSidePart:

Bokutachi ga Yarimashita- Its not the main story-line though

Hana Yori Dango

Strong Woman Do Bong Soon (kinda, sorta)

Suki na Hito ga Iru Koto

 mahiba:

Cruel romance (c-drama)

The queen of SOP (I think this drama is exactly how you explain. The thing is, it's more about the main Female Lead and Office stuff than about romance.)

 In time with you 

 panchi:

Moon Lovers:Scarlet Heart Ryeo 

-it's kind of similar to what you want

Thanks! If you have anymore, please post them.

Nice, I'm a sucker for this kind of story lines!

First: the mother of all stories with all elements combined:  https://mydramalist.com/2987-boys-over-flowers/  https://mydramalist.com/698-hana-yori-dango / https://mydramalist.com/141-meteor-garden

Second: https://mydramalist.com/16159-go-princess-go- campy story and gender swap as well! The manly princess feels attracted to the concubines of her husband. Her husband hates her/his guts at first, but soon regrets his actions.

Afterwards: some rom coms (though the female doesn't "pursue" the male lead that much)

https://mydramalist.com/16921-go-hos-starry-night - She's way to busy with men at work to notice her starry eyed boss

https://mydramalist.com/88-prosecutor-princess  - She's so eager to catch the prosecutor, she doesn't notice the male lead

https://mydramalist.com/2471-love-keeps-going - she's a sweet caring girl fulfilling every need of her boyfriend, highly irritating his brother

https://mydramalist.com/3623-sound-of-the-desert - she falls in love with a calm and kind scholar, and doesn't see the efforts of a handsome, cold general who stood her up the first week they met.

https://mydramalist.com/3708-arang-and-the-magistrate - an arrogant magistrate, totally full of himself, reluctantly helps a female ghost to resolve the mystery of her death. He turns  into a gentle  loving character. She falls again for the bad boy, her former fiancee.