Same director and screen writer plus the main leads of The Killer Is Also Romantic have Cameo appearances there and you see their child! So if you miss them, watch it to heal your heart! Also noteworthy, the subs are much better!

In both dramas the legal enforcers work together with an allegedly criminal to unreveal the big schemer in the dark and get entangled in a big conspiracy that can shake the foundations of the big bustling towns, the protagonists live in, or even worse.
Appart from plot similarities and the fast pacing, there are parallels in very good chinematographic and music stylistic means used to substanciate the emotions like suspense, action and to make the big town, at their respective epoch, lively and belivable.

Badass Female Lead, who takes violent revenge without taking care off her self wellbeing. Both movie titles start with "The V..." :)

Similarities:
- A strong female lead in an action packed movie taking bloody revenge without minding her own wellbeing.
- Lots of fighting blood and violence

Differences:
- human trafficking and abduction with sexual abuse of the abduckted (read the taggs before watching)
- FL trying to safe the abducted younger sister
- no law enforcement authories involved

Another action-filled show that illustrates how two characters on the opposits of the law, Cop<->Villain find common grounds and a little bit of romance.