Before I start reading, what's this story about? I cant find any explanation anywhere

Mc is a kind, righteous lawyer, whose sister sends him to work for a big law firm under a very prickly and competent lawyer to protect him. She’s married to a chaebol and the relationship is not going good, so she doesn’t want him to get caught up in the fallout.
Mc and ml are polar opposites, but they have a bit of shared history and a lot of tension. They’re both drawn to and captivated by each other, despite their differences, as they work together, they slowly fall for each other completely.