If you're a fan of the US shows: Criminal Minds and Mindhunter, then this will be a favorite for you. As for any crime show there's a ton of TW's and can be a bit more gruesome due to it being about the killers being interviewed. If you're okay with heavy material, then proceed!

What initially kept my interest in the show is how well the two ML's mesh together. Their friendship and bond and overall chemistry together really helped keep light when needed after the heavy subject matter. It adds even more of a great mix when you add the Seoul Police Department team into it too. I also loved the psychology aspect of the show and seeing the team delving deep into the minds of criminals.

The show never once slows down, but I left the rewatch at 9 since you already know all the twists. Although, I could see this becoming a favorite or a show I would be down to rewatch in a year or 2.

This contains a potential spoiler!
The one problem I did have is I felt that the BAU team didn't actually really catch some of the criminals. They helped put together a profile for them, but some just fell into their lap or had a really easy solution to finding them.