Actually I didn't like very much even the japanese version, I still tried this because maybe would have been different.
First of all in both versions I don't understand why the title "rich man, poor woman"...isn't it kind of a thing in 97% of dramas?...could have been named "the ceo and the employee" or "cheerful and naive girl falls for her boss who have some sort of past trauma" at this point.
The female lead's motivations were so weak when she claimed she wanted to stay in the company or beside the ceo (first time that she rejected the vice-minster woman) and I really can't understand what kind of character she should be...how can someone that can memorize an entire book and do all that administrative work (when they founded dancing whale) is considered dumb? The world is divided only in magical geniuses and idiots? And why she let people call her that way? She showed a little of attitude only in the last episode but so drastically that she seem another person entirely...
And why all that shareholders/meeting whatever footage?
The male lead was sorta okay, but in comparison with the japanese one he lacks a bit of charisma. I personally not really into that type of character so I even found him annoying sometimes.
The romance between the girl best friend and the womanizer guy was more interesting that the leads one.
Second female lead was annoying, I liked the one in the japanese version because she was competing fairly without being bitchy with the fem lead.
Some scenes (crying scenes mostly) were a bit weird, they overacted a bit.
Overall it gave me a Steve Jobs biography vibe with a little of Zuckerberg (the mini file/big file project), probably the original writer was inspired by those.
I found it very boring, won't recommend if you're looking for cute romance or comedy.