Are you open to long dramas? If so:
Ugly Alert (133 eps - many of which are skippable)
My Precious You (54 eps - same here)
The World that They Live In - (16 eps)
None of the heroes actually become millionaires during the course of the drama, but they start out poor & end up in a significantly better place by the end.
I would also second the recommendation for
Golden Empire above.