The titles mentioned above are quite a list already, but here's a refill:
https://mydramalist.com/15931-hwarang-the-poet-warrior-youth She is streetwise and strong, sustaining not one, but two male leads that are weak and underperforming at first
https://mydramalist.com/3386-king2hearts A shallow playboy prince in South Korea becomes eventually a king to be proud of, with the help of his female military wife from North Korea
https://mydramalist.com/2658-protect-the-boss A streetwise secretary who's not afraid of using her fists, starts to protect her weak boss. He suffers from anxiety disorders, and an abusive family.
https://mydramalist.com/12647-angry-mom A woman with a hidden past as gang member protects husband and child against bullies and criminals who infiltrated the school of her daughter
https://mydramalist.com/8-secret-garden-2010 A sturdy but shabby stunt woman becomes the love interest of an overprotected, arrogant CEO, against all odds. She helps him to overcome his anxiety disorders, an unhappy past, and an evil mother.
https://mydramalist.com/2410-penny-pinchers A total loser and student drop out ends up being the personal slave of a hardworking, money pinching girl who pays off all his debts. Their relationship isn't that bad after all.