Romantic amnesia series

Rich arrogant guy loses memories and gets used by poor family as a worker. A girl falls in love with him and he grows to become part of the family. Later they discover his identity and they give him back to the rich family. He regains his memories but loses his memories as a worker for the poor family and also his love for the girl. The girl tries to win him back but is unsure herself whether he can still be the guy she loved. 

A recently married prosecutor goes undercover as a performer and goes to live with a weird family he suspects are part of a criminal network. After some time passes he discovers the real criminal but endangers the lives of the family and almost gets killed himself. The weird family fishes him up but he loses all his memories. He can't be identified, his family thinks he's dead and the only available information is that of the weird family who assumes he's just a performer. The girl of the weird family takes him in and he goes to work while still searching for his identity. 

Girl grows up with her abusive stepmom and two step-siblings. She loves a childhoodfriend who is outside of the country but her step-brother also falls in love with her. She ends up with amnesia when trying to meet her childhoodfriend and her step-brother takes her in his home and starts a relationship with her. Her childhoodfriend assumes she is dead but suddenly encounters her again years later when he is in Korea but she doesn't remember him. 

At some point they both do a memory wipe and meet again but is this really worth 54 episodes? I will probably not watch this anytime soon.

Guy has amnesia but its not revolving around romance

Royal girl gets amnesia, will try this one

Not yet watched but girl gets amnesia

Not my type of amnesia romance story but it was okay. The guy is rich and enjoys life, gets amnesia but never really has to change in a big way. He just kinda continues his ways by slightly adapting to the new environment and the poor girl has to deal with him being needy a lot.