Both series shares a cult like organization, leading people to believe in lies and covering crimes by involving past incidents that has nothing to do with an event happening in present. The lives of people closely tied with each other, it shares crimes of human beings.
People who are trying so hard to uncover truth & powerful people supporting the cults are creating obstacles.

Both series shares a cult like organization, leading people to believe in lies and covering crimes by involving past incidents that has nothing to do with an event happening in present. The lives of people closely tied with each other, it shares crimes of human beings.

- doppelganger identity switch as both are twins and the high school twin has to impersonate like the other one
- comedy, drama so it's a one time watch

- doppelganger identity switch as both are from time travel and the good/evil impersonate like the other one
- plenty of twists, thriller & every episode will keep you on the edge of what happens next

- doppelganger identity switch as both are clones and the evil clone impersonate like the other one
- plenty of twists, thriller & every episode will keep you on the edge of what happens next

I think plot sounds similar only a little

- doppelganger identity switch as original has to impersonate his other identical instead of his place
- ML is a cop ( 1st he is a cop but later he had to show others he is the other twin)
- plenty of twists, thriller

- doppelganger identity switch as original gets kidnapped so fake has to impersonate him
- ML is a judge (YH is about identical twins so one is judge other one is a thug)
- plenty of twists, thriller

I think plot sounds similar only a little

- doppelganger identity switch as original had an accident so fake has to impersonate him
- ML is a prosecutor/lawyer (only original is a prosecutor fake one is a con artist)
- plenty of twists, thriller

In this dramas ML /FL are best NIS agents in their fields
He/She lost someone close to them
Related to whole mystery and conspiracy
both include a lot of action, crimes and investigations

Both dramas ML are best agents in their fields
He lost someone close to him
Related to whole mystery and conspiracy
both include a lot of action, crimes and investigations

Both dramas ML are best agents in their fields
He lost someone close to him
Related to whole mystery and conspiracy
both include a lot of action, crimes and investigations

Both Dramas ML are top elite agent in their field (TV - NIS agent , K2 - Soldier)
Due to some reasons ML gets rogue/disappeared due to conspiracy
Full of Action, Mystery, Thriller which will keep you on the edge to watch what happens next
If you like the veil I suggest to watch The K2 as well