I've picked up this drama because I'm a huge Suho fan and I had to watch it. However, my review will be bias free and I'll try to keep it objective. So, first of all, I have not watched the japanese original one, so I can't say if this is better or not. But I did enjoyed some parts of this drama. Some scenes were cute and funny. But, I did not like the story line, as it was kind of messy. Aslo, the romance was weak. I mean, the lead had more kissing scenes with the second lead lady than with the leading lady. I guess, the drama focused more on the company, on the friendship, the past mystery, which wasn't that big, the development of the main character, and left everything else out until the very last episode. There were some sparks here and there, but the love story was very spread out. Aslo, I didn't like that sometimes the acting was a big too forced, like overacting. But that was the case for a few scenes, so I can overlook it overall.
Summing up, Rich man was an okay drama. It isn't a total wast of your time, just don't expect too much out of it.