Original Sin (2018)

Both stories are dark and the relationship between the two leads developed from hating each other to full cooperation.

Dark thriller, bromance, intersting plot and characters...........................................

Both have two male leads who have a (somewhat) close relationship but are opposites when it comes to their morals. One character is more involved with the underworld while the other character is a righteous police officer, meaning they butt heads frequently but still work well together.

Both dramas have that same gritty feel to them and are focussed on crime.

Both series are about pointing out the pretensions or hypocripsies in society. People caring too much about money and material goods.

2 ML - one cop with calm persona and one non-cop witty and fun person , cooperate together to crack the case.

The biggest similarity between the two shows is the dynamic between the two leads, who are police officers tasked to work together and solve cases. One of the officers is very serious and has a mysterious history whereas the other is more outgoing and 'fun'.

In both shows, the two leads are reluctant to work together but over time, become very close and work well together.

The biggest difference in the shows is that MIU404 is more comedic and wholesome than OS, which is grittier and deals with more serious crimes.

Both are good watches if you are looking for a crime-solving duo that has good chemistry.

Together solving cases (murder, missing persons, etc). One cop with calm persona and tent to be more serious in his worklife while another one is a fun character but smart ass.

Both stories are in the Crime, Detective, and Mystery genre that feature an unlikely cooperation between two polar opposites. Later forming a strong bond/friendship that even goes to lengths of sacrificing oneself for the other.