So now Min-hong is working at Ra-hee's company. So, technically, all the main characters in "Single Wife" are now working at the same company. It's a good thing we get to see Min-hong's portfolio right away because in spite of this fact, no one at this company ever seems to do any actual work. Far from working, all we really see anyone doing is having concluding work dinners once work is finished.
This is, I admit, a fairly minor issue to harp on. I can think of plenty of dramas where it made zero difference what the main characters did for work. I can also think of some where discussion of work definitely lowered the overall quality of the drama, as it was clear the writer didn't have the slightest idea how the probably arbitrarily chosen profession of the lead characters actually works in practice.