Honma Kai is blessed with genius mind and Ichinose Jiro with compassionate heart. When it comes to physical strength, They aren't some Kind of super heroes who will beat every single villain out there but they got skills man! I have read the synopsis of original k-movie, It was based on a single kidnapping case but as this version was extended into a drama, Many thrilling stories are introduced with each episode. Episode 4 gave special attention to Honma Kai, and followed by it, Ep 5 features an emotional yet funny character introduction of Jiro-chan. This will not follow your basic trope of hate to love kinda friendship as they pretty much clicked with each other in ep 1 itself but you will gradually see their chemistry getting better.
Apart from their journey as police trainees, The plot holds a thrilling twist in final three episodes. You have to patiently wait for it because writer did a great job in confusing viewers. We can say that the start was weak but It gets better and ultimately become one of the best cop drama.
Also there's something You can't resist, Hirano's voice !!! So what you waiting for, try it ASAP.