Soul (aka Possessed)
This is probably the scariest out of the options. Only 10 episodes, it is a fast paced scary ride full of murders, ghosts, and truly messed up concepts of justice. We see sweet Ha Na ( Im Joo Eun - Wild Romance, Whats UP) witness multiple murders including that of her twin sister. Upon going a little crazy, she emerges possessed by her sisters vengeful spirit and is used by profiler Shin Ryu (Lee Seo Jin - Damo, Gye Baek) to murder people who had escaped justice. If you want the in your face scare, then this is your drama. I often jumped because of the ghosts and I would personally not watch this before bedtime. However it does have slight jumps and holes in the plot so don't expect a masterpiece when it comes to the script.
I know that if you were judging from the title alone you would assume that this is either super cheesy or something via twilight. However viewers are surprised to find a really solid crime drama behind the weird title. And although this is not a traditional scary drama like Soul, it does have its suspenseful moments. And even better then that it has Yun Jung Hoon (I summon you gold, Can love become Money) playing Prosecutor Min Tae Yeon. And he is all kinds of gorgeous, amazing, charismatic, stick a bow on him and give him as a present, hunk of Korean male. Through two seasons we follow him on his quest for justice against both the living and the undead.
Vampire Prosecutor Trailers:
This is my go to drama when I want something well written and super suspenseful. This drama takes us to Susin High School, nicknamed "Prison High," it is an elite school attended by the top 1% of students in the country. Stuck in the middle of the mountains with no outside influences the only thing that the students do is study and wait for Christmas break to leave for a week to visit their families. This Christmas 7 students and a teacher remain and are confronted with a killer among them who is interested in finding out if monsters are created, or if they are born. With one of the best up and coming cast of young actors, it is an amazing drama that feels reminiscent of a good Agatha Christie murder mystery.
White Christmas Trailer:
One of the biggest hits of 2013, The Masters Sun is the story of Tae Gong Shil (Gong Hyo Jin - Greatest Love, Pasta) who's life is falling apart because she is able to see Ghosts. When she discovers that the ghosts disappear anytime she touches Joo Joong Won (So Ji Sub - Ghost), she becomes determined to stay close to him regardless of the costs. While this drama has its share of spooky pop out at you ghost, it is more a romantic comedy then a horror drama. So if you are looking for something of a lighter scary nature then this is a safe bet. It has a sweet romantic story from start to finish and I truly enjoyed all of the characters.
The Masters Sun Trailer:
Sign is a tightly written medical investigation drama about forensic doctors solving murder cases. While from first glance this looks like any other murder/medical drama it starts to surprise you from the beginning and as you delve into the murder of an Idol Star which leads to the hunt for a cunning Serial Killer. Some of the best suspenseful moments in any kdrama I have watched to date where in this show. The OST creates a mood of frantic energy which just heightens your watching experience. Be sure to stick with this drama to the end since it has one of the best dramatic endings that I have ever seen. I literally forced my mom to finish this one because it is that good. Sign Trailer: