They don’t follow the same plot but they both are very unique si-fi mystery plots.
If you enjoyed the tone of one of the two dramas then you’ll probably enjoy the other.

It follows the same plot of a group/pair of professionals (e.g. a hacker, a con artist) who worked together in order to act out their revenge and take down the bad guys.
They both have a nice blend of humour and action.
I really recommend both dramas :)

Both dramas follow the same plot of a team of “professionals” (e.g hacker, con artist) who worked together to bring the villains down.
Fabricated city has a much more serious tone than Leverage which is more humorous.
But I really recommend leverage if you like a team following plot with action

Ji Chang Wook is the main lead in both the show and movie.
Although it does not follow the same plot of an undercover agent, and instead a gamer framed for murder, it is similar to Healer's 'teamwork' of allies working together to find the truth (including a hacker)
However, fabricated city has a much more serious tone than Healer in terms of action, and a warning of quite gruesome and emotional scenes.
But if your looking for more Ji Chang Wook content or something action packed with good fighting and car chasing scenes i recommend fabricated city.
But if you still want that romantic vibe of a classic kdrama then Healer is the one.

It follows the same plot of an undercover 'agent' who has to hide his identity in order to complete his missions.
Falls in love with the LI while on a mission resulting in her becoming his 'weakness' and someone he has to save.
Like healer, the LI starts off with a 'crush' on the second lead but eventually falls for the main guy.
You have your nice share of corrupt politicians and people in higher power.
The comedy feel in Healer is enhanced more in man to man but there is still a good amount of action/tense scenes.
I would really recommend watching this is if you loved Healer, both lead actors are great.