Past


ML stay in FL house or FL stay in ML house

suspect is trying to solve the crime to clear herself

FL is a policewoman or lawyer

Lawyer


Serious or Funny FL

preparing to get married 

main character is a soldier or assassin

FL is only a few inches shorter


Female or Male best friends turned enemies

female

Bromance or sismance

Bromance


ML is an normal employee or ML is a chaebol heir

more period appropriate 

blind date or double date

blind date

arranged marriage or contract marriage