Kim Sin becomes a goblin after his death, and lives for more than 900 years. For those times, he watches deaths and births of humans, being a guardian for them when necessary. However, one day, a girl appears in front of him and everything changes.

Kim Sin fears the existence of the girl who claims herself as the goblin's wife. Meanwhile, Euntak and Kim Sin spend time together in Canada and Kim Sin feels a special emotion towards her.

When Euntak is in danger, the goblin and the reaper appear out of nowhere and saves her. Meanwhile, the reaper sees Sunny for the first time and tears fall from his eyes for no reason.

The goblin is sure that Euntak is his wife, but soon he becomes fearful of his upcoming death. Meanwhile, Sunny cannot stop thinking about the reaper.

The goblin finally decides to end his life, hence he ends up living together with Euntak. Meanwhile, Sunny slowly falls in love with the reaper.

The goblin finally asks Euntak to pull out the sword that has been stuck in his body for 900 years. Meanwhile, the reaper also realizes he has feelings for Sunny.