Crime/thriller dramas to get someone into kdramas?

I'm looking for crime/thriller dramas for my mom. I managed to get her to watch The Glory despite it being more focused on revenge. She liked it. It was the first kdrama she's ever seen.

She wants shows that are on Netflix and that are short. She was hesitant about The Glory due to its length — 16 episodes, each an hour long.

Most of what I watch is either not in her prefered genres nor on Netflix, so I don't really know what I should recommend her