Divorce Lawyer in Love: female lead starts out in a higher position than male lead when they first meet, then the roles are reversed
Gasohug: female lead has a career (something to do with fashion or design? it's been a while since I've watched it!) and male lead works as a gas station attendant
Kimi wa Petto (2003): female lead works in an office and she picks up the male lead off of the streets so he is essentially homeless/jobless when they meet
Kimi wa Petto (2017): updated version of the 2003 series (I prefer this one personally)
Look Tard: female lead is the daughter of a rich man and the male lead is one of her family's servants (one of my favorite shows ever!)
Maids: female lead starts off as a rich young lady and then her family falls from grace so she becomes a servant and meets a male servant
Mama Gogo: female lead inherits and runs a nightclub and the male lead is a gogo dancer in that club
Smile, You: female lead is the daugher of a rich man and their family runs into issues so they have to move in with their chauffer's family, the chauffer's son is the male lead
That Fool: female lead is a celebrity and male lead is a postal worker