The individual cases were layer up until the last one making the audience comfortably enjoy the complexity of human nature and the unfortunate circumstances the victim and perpetrator ended up with. It shows human behavior and how art is used to show that as it not only identified suspects but was a vital part of Shen Yi and who he is
Shen Yi is a very perspective individual who noticed the little things that made breakthroughs in cases making him highly popular among the police force which for me made but likable with his empathetic nature toward others
There is character development as at first he is a little unsure of himself and his position but slowly warms up, especially with Du Cheng whose past is linked to him with a tragic event.
Du Cheng, I believe he is a great officer but at times reckless with his decisions endangering other's lives