This drama was so good, I don't understand why hasn't been watched much.

First I loved two characters, Lin Yuan Hao and Song Bai Yu. They are like day and night. They are opposite each other but at the same time, they are similar. I can also say that the actors did a great job. Especially in the last episode, Yuan Hao's expression while smiling at Jin Yi Tong made me hear the phrase 'You look so alike' throughout the drama in my mind again.

Secondly, the motivational sources of bad characters in detective series have always been important to me because I don't like 'pure villians', I prefer villains with a logical background and this series provides that.

I liked that the show didn't fool the viewers. They work things out step by step, and that's satisfying. I'd rather be suspicious of someone step by step, than someone I've never suspected turns out to be guilty.