punctuation - Should I use a comma before "who" in this sentence, or can it be written without that comma?

Which of the following is correctly written as far as its comma (or lack of comma) is concerned?

1. People who love their jobs can easily excel in their fields of work than those, who put salary on the first place.




2. People who love their jobs can easily excel in their fields of work than those who put salary on the first place.

I have read that we should only put comma before who when it adds extra information, but here I think who begins an essential part of sentence necessary for fully understanding it.