"What have i done to DESERVE this? What is my SIN?"
"You went looking for DEATH even before DEATH came looking for you."

PLOT/STORY LINE
It's the story of a young man who's greatest sin was to go looking for death before it even ever came looking for him.[commits suicide]
Death angry at his audacity and insulted by his flippant attitude towards dying, comes to punish him with her game and mindfuckery: He is to be reincarnated into bodies of 12 people 12 times just to ultimately die, he must experience death over and over again through 12 other lives. But the only way to change is if he can find a way to survive the imminent death coming for these lives, he gets to live out their lifetime in the same body.
The ML is not A PERFECT HUMAN, no he is just as selfish, greedy, stupid, overconfident. And he is also sensitive, emotional and sentimental. He has faults and i think thats makes the story even more better.

The DRAMA has everything. It has THRILLER, ROMANCE, COMEDY, very DARK HUMOUR[surprisingly], ACTION SCENES.

CAST/ACTING
Holy shit, can i say this cast is like INSANE. Like it screams A MILLION BUCKS and has HIGH BUDGET written all over it in bold. Dare i say this might be the most iconic cast in a decade, like imagine all the famous and amazing K-actors of recent time all coming together to create a big bang with this.
And not only the cast is giving the VISUALS but that acting is a slay. The way each actor portrays the character and story is just chef's kiss.

The way you see the protagonist goes through thousand different feeling during the whole trail makes you feel like you are living the character.
The feeling of hopelessness, sadness, betrayal, pain, anger, frustration is so potent in the series that you feel it in your bones.
THE CINEMATOGRAPHY, THE VISUALS, THE OST, THE BGM, THE PLOT LINE, THE ACTION SCENES.
Everything seems like perfection.

Like i have nothing more to say other than that NOT WATCHING this is a loss. It is damn near the best kdrama i have potentially seen this year.