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The promise - female lead
Queen of ambition - male lead

What made The Promise and Queen of Ambition similar is that

-the main characters' lovers left them and their children for them to marry into a wealthy family.

-They ended up as a single mother/single father.

-Both main characters supported the study of their lover but they ended up betrayed by their lover.

-The main characters' have twin siblings and they have mistook them as the main characters and was killed by accident or murder.

-The main character chose to pretend as their sibling and to avenge their siblings' death and their goal is to revenge on the person responsible for their siblings' death.

-Both the main characters have their children killed also.

-The main characters' character development is really good.

-Both dramas are good makjang

-Long Lost Daughter
-the SFL seduced the FL's lover
-FL is being looked down
-Stereotype poor and rich characters
-SFL gets what she wants
-The cheater male lead
-the biological mothers who doesn't know their real daughter.

-Both dramas have dark elements of Makjang like murder, birth secrets, hatred, greed
-Both female lead are badass
-Both female leads are adopted
-Both female leads are being abused by their adopted mother after discovered that the female lead is not her biological daughter
-Both second female lead is envious towards the female lead
-Both second female lead are annoying and selfish
-Both second female lead has hatred towards the female lead
-Both dramas shown the younger years of the characters
-Both female lead have tragic incidents
-Both female lead have different names
-Both female lead are adopted by the enemy of her parents
-The both of adoptive fathers was the one who murdered the parents of the female lead

Hana no Arash and Innocent Man have similarities
-Both antihero main lead.
-Poor guy/rich woman trope
-Revenge
-Makjang-ish
-Time skip

Both dramas deal with characters with terminal illness and tragic love. Both of the characters lied to their lovers to hide their illness.

Similarities

Doppelganger identity but both twins however the other twin have plastic surgery and the other twin has to be an imposter to pose as that twin.

Both Bite Sisters and Hotel del Luna have immortal female lead and both have fashion sense but in Bite Sisters the female lead is immortal because she is a vampire. Besides, it has both interracial relationship between immortal and a human

-Both Makjang dramas
-Both dramas have selfish mother as a protagonist
-Both dramas have the daughter who hates her mother
-About Conglomerate

Both drama have :
>characters have antihero qualities
>characters that lost their own family
>tough past and backstories
>Fake identity to infiltrate and spy the person
>one of the characters are hackers

Taxi driver has more graphic violence. Honeys is written in a lighter tone

Both dramas are twisted makjang drama.
Both dramas have the same themes such as Extramarital affair, illegitimate child, conglomerates, non-straight character and tragic past

FEmale leads being betrayed by their own boyfriend/husband by marrying rich woman. The female leads fall in love with the brother of the rich woman seek revenge.

Both dramas are makjang, dark and about revenge. The FL married/engaged to the ML however the SFL - the villain is jealous to the FL... so she steals and seduce the man and both dramas have the FL who were framed for murder and wrongfully imprisoned. Their children went missing because of the villain. The person they loved were taken by the female villain and has the FL falling in love with the second male lead.