I can't believe i dropped this drama exactly 12 months ago, i regret it so badly now but i rated it 5/10 because there were so many names to assimilate at the same time, then i got recommendations of this drama many times so i decided to finally pick it up. I finally understood the plot while watching episode 4 THEN THE STORY BECAME SO INTERESTING and god the actors did such a good job especially the main killer, he gave me chills plus the cliffhangers were so unstandable it took me 3-4 days to finish it and even the ending is satisfying. I wish i could find another drama like this.