There is nothing to do, when the Koreans want to hit and shock the viewer they succeed and do not make discounts and this excellent mini series is the proof.
A Bloody lucky day is a tour de force in the meanders of human madness and wickedness and everything is told without discounts or censorship, all the horror and gratuitous wickedness that emanates from the character of Lee Beyong Sin freezes the blood, among other things excellent performance by Yoo Yeon Seok really excellent, and we end up in a whirlwind of truly devastating madness.
Also great is the character of Oh Taek (extraordinary Lee Sung Min) of which we see the change during the various episodes, from a helpless victim and incapable of reacting to a ruthless avenger.
The story nails the viewer to the chair from the first to the last episode, the script, with continuous flashbacks is written impeccably, without even the slightest smudge, something increasingly rare, especially in bad American productions.
A series that you absolutely must watch, knowing that in the end you will be left shocked and disturbed.