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Both dramas are crime thrillers with a police detective as main lead.

Both deal serial murders from the past n present / connected crimes.

Even the main lead is suspected of being a murderer in the past crimes, in both the dramas

Both have a Revenge Seeking main lead / trying to prove his innocence by catching the true culprit

Actor Kim Nam gil acted in both the dramas.

Both the dramas are of different genres, nothing in common and are just another works of the actor.

But the variations in his roles in these two dramas, surprises alot .
In one, as a cold introvert person, who never talks (dark vibes surrounding him) and in another as a fiery n yet funny n lively person, who never stops talking n smiling, punishing the bad guys and giving evil smirks to them, haha

Actor's fans will enjoy and love both.

Both are BL dramas.

Both have Master - Slave / boss - servant theme.

Both have a plot of servant secretly in love with his arrogant master.

Both have emotional Unrequited Love theme n later forbidden love theme (forbidden by parents)

Both are BL dramas.

Both have Master - Slave / boss - servant theme.

Both have a plot of servant secretly in love with his arrogant master.

Both have emotional Unrequited Love theme n later forbidden love theme (forbidden by parents)

Both dramas are BL ...

Both dramas have one main lead as a bodyguard to the other main lead...

Both Bodyguard turner lover trope

Both dramas are BL ...

Both dramas have one main lead as a bodyguard to the other main lead...

Both Bodyguard turner lover trope

Both dramas are BL ...

Both dramas have one main lead as a bodyguard to the other main lead...

Both are Bodyguard turner lover trope

Both dramas are BL , involving themes of mafia, gangster, assassins and crime

Both are of action, crime and romance genre

One or both main leads are related to mafia in both dramas.

Both are a good mix of action, crime and love

Both dramas are BL , involving themes of mafia, gangster, assassins and crime

Both are of action, crime and romance genre

One or both main leads are related to mafia in both dramas.

Both are a good mix of action, crime and love

Both dramas are BL , involving themes of mafia, gangster, assassins and crime

Both are of action, crime and romance genre

One or both main leads are related to mafia in both dramas.

Both are a good mix of action, crime and love

Both dramas are BL and are shared universe, written by same author and from the same direction team.

One of the main leads in both dramas, is a doctor

Both are a good mix of suspense and love

Both dramas are BL , involving themes of mafia, gangster, assassins and crime

Both are of action, crime and romance genre

One or both main leads are related to mafia in both dramas.

Both are a good mix of action, crime and love