First couple of episodes were rather strong.
Then it devolved into unoriginality. All tropes of the genre are here.

Bad guys turning on each other. Bad guys using bigger crime to cover smaller one. Mc pushed into corner by bad guys, it backfires. Mcs never compromising on their ideals, winning through deus ex machina. Ex husband saves the day. Hidden recording ex machina. Hiding evidence for own crimes instead of destroying it, it backfires. Bad guys can kill everyone except the mcs. Threatening wealthy officials always works (when it's done by good guys, bad guys need to bribe them). Good guys win and take responsibility for smallest crimes, bad guys are ruined, justice wins blah blah.

All of that is rather digestible, if you like this kinda storylines. But the character of the mc, Hawng Do Hee, is insufferable. Her motivation makes no sense, she was doing dirty work for corp for a decade, yet sudden suicide of one of the workers sents her rebelling and crying her eyes out. Then eventually winning through a combination of plot convenience, deus ex machina and plot induced stupidity (she's quite dull, although narrative paints her as brilliant).
And gosh, she cries a lot. When she isn't being cocky or laughing like an old witch, she's either crying on on the verge of crying.

She also look 20 years older then her character is supposed to be, really funny when matriarch of chaebol calls her an adoptive daughter when they look the same age.

If this was the story about a corrupt fixer fixing rich people's fuck up, it would have been better. If this was a story about Oh Kyong Sook's inspiring rise to power from activist, it would have been better(her character was far more likeable). But with narrative focusing on Hwang Do Hee so hard, I found it really hard to enjoy this one.

On the side note, all villains were well acted and decently written, so it was a shame to see them lose. Especially Kim Se Byeok as Eun Chae Ryung(the inheritor daughter of chaebol) and Seo Yi Sook as Son Yong Shim (the matriarch).