Wang Yeo

Wang Yeo (왕여) a.k.a Grim Reaper (저승사자)
The Grim Reaper is a central character of the drama Goblin. His duty is to collect the souls of those who have died, allowing them to pass on to the Afterlife. He eventually comes to lease Kim Shin/the Goblin's home, causing tension between them as they have to live together under the same roof. He at first attempts to collect Ji Eun Tak's soul, wanting to reduce his paperwork load due to her having been saved from death by Kim Shin, but is consistently thwarted in his efforts. Once he realizes she is the Goblin's Bride, he encourages her to be close to Kim Shin, as he is eager for her to remove the blade from the Goblin and allow him to finally die.

Personality
As one who guides spirits to their resting place, the Grim Reaper is shown to take his work very seriously and with solemnity. He is often introverted and quiet, composed with an air of quiet confidence and authority. He is only harsh to those souls who deserve it, and to Kim Shin, with whom he constantly bickers. At the same time, he also shows a kinder side with more innocent souls, as well as with his fellow Grim Reapers and Sunny. He dislikes when a soul such as Ji Eun Tak escapes him, as he does not want to have to deal with the inevitable paperwork such an anomaly will cause for him.

Living with Kim Shin, the two often have spats, with each trying to one-up or get rid of the other, though the two often have genuine moments of understanding and friendship. The Grim Reaper also seems to have a preference for vegetables and salads, as well as an addiction to dramas. He is also naive when dealing with human technology, having never used a smartphone before and shown comical difficulties learning to alongside Kim Shin, as well as misunderstanding certain social behaviors.

Biography
At first, not much is known about the Grim Reaper's life. What we know about the Grim Reaper is that he collects souls when they die, and brings them to judgment to decide to either go to Heaven or Hell, or sometimes to be reincarnated. Before becoming a Grim Reaper, those who are appointed the position have memories of their past lives and sins erased, including their former names, which is a tender point for the Grim Reaper when it is brought up. When Kim Shin mentions this during one of their fights, the Grim Reaper becomes visibly upset and broods over what his former life may have been, worried he may have been a murderer. He continues to agonize over this when he becomes smitten with Sunny, as he cannot answer basic questions she asks him, such as his name and phone number (prompting him to create a false name, Kim Woo Bin, to impress her).

It's hinted at, then revealed later in the series, that the Grim Reaper was originally King Wang Yeo, the emperor who, under the influence of his eunuch, Park Joong-heon, betrayed and murdered Kim Shin (though it's took quite a long time for Kim Shin to be aware their past connection). Also worth mentioning that Wang Yeo had been married to Kim Sun, Kim Shin's younger sister. Though he genuinely loved his wife, in his rage and jealousy , he still had his queen excuted when she sided with her brother against him. Unfortunately, Wang Yeo later came to deeply regret his actions, and committed suicide prior to the series. As suicide was considered a great sin, Wang Yeo was denied passage to the Afterlife, and was instead appointed a Grim Reaper, with no memory of his past deeds. Even so, when they meet, he is able to subconsciously recognize the reincarnation of his wife, Kim Sun, as the present-day Sunny.

Powers
Being a Grim reaper, Wang Yeo is very powerful and have extensive abilities
 * Astral Perception - Wang Yeo can perceive true form of beings invisible to human's eye. He can even see supernatural incidents.
 * Chronokinesis - Wang Yeo has control over time. He can slow down the time and even freeze time at will.
 * Cryokinesis - Wang Yeo has the ability to freeze objects, making items so cold that they will crack.
 * Cosmic Awareness - Wang Yeo has incredible amount of knowledge of the universe, he knows when a person is supposed to born and die.
 * Invisibility - Wang Yeo has the ability to make himself or others unable to be seen by other beings by means of his hat.
 * Immortality - Being a reaper, Wang Yeo is immune to aging.
 * Memory Manipulation - Wang Yeo can make other beings forget things and can also restore memories.
 * Precognition - Wang Yeo has the ability to see the past, present and future of an individual by having physical contact with the them.
 * Superhuman Resilience -  Wang Yeo's durability, stamina, vitality, virility and endurance have been enhanced to superhuman levels. He has a higher tolerance to pain.
 * Supernatural Senses - Wang Yeo possesses acute senses that are above superhuman level. He can see, hear, smell, taste, touch more accurately than most beings.
 * Supernatural Speed - Wang Yeo possesses super speed. He is able to appear and disappear with a blink of an eye, and are able to move across a room within a second. He can move, run, jump, climb, and fly at the speed of light.
 * Supernatural Strength - Wang Yeo is incredibly strong, capable of exerting high amounts of superhuman physical force and has displayed vast levels of superhuman strength, when he so desires. He can surpass humans and most supernatural beings.
 * Telekinesis - Wang Yeo has ability to move objects as well as individuals with the mind. It can be channeled through the eyes or hands.
 * Telepathy - Wang Yeo has the ability to transfer information from one mind to another and to read mind and thoughts of humans, animals and other beings without the aid of physical communication (noise or movement).
 * Teleportation - Wang Yeo has the ability to teleport from one place to another anywhere in the world instantly, as well as take others with him.

Behind the scenes
Lee Dong-Wook and Gong Yoo have a cute little bromance.