rich guy living like he's not rich

Coffee Prince

Live Up to Your Name - technically, since he can't spend his wealth.

I Hear Your Voice - has a nice apartment and is set financially due to a life insurance pay out, but spends most of the drama living with others who are not as well off.

My Secret Romance - briefly at the point when the main leads meet. 

It's Okay That's Love - famous author has to lie low after a scandal and moves into a house he owns + gains three roommates.

Male lead:

Dalja Spring

My GF is a Gumiho

Jang Bori is here

Feast of the Gods

Witch romance

passonate love

My unfortunate Boyfriend

The legend of the blue sea

My Shining eunsoo

Female Lead

Ugly Alert

Happiness/I Am happy

Lovers in Prague

High Society