Yoo Deok Hwa / God

Yoo Deok Hwa (유덕화)
Yoo Deok Hwa is the grandson of Yoo Shin Woo and the only grandson of the Yoo family, who have been tasked with taking care of the Goblin (Kim Shin) for centuries.

He is named after a famous Hong Kong actor [Andy Lau ] by the Goblin(Kim Shin) because the Goblin was obsessed with the actor in 1992, when he was born.

Biography
He was raised by his grandfather. It is not known who his parents are or were. He is currently the last descendant of the boy who promised to serve Goblin when he became an immortal being. In addition, he will become the CEO of his grandfather's company.

God
Some fans theorize that Yoo Deok Hwa may be the God because of various scenes and cultural hints in the show. Confirmed at the end of the show, when God reveals He is inside of Deok Hwa's body. The clues:


 * His very impressive and god-like abilities to stop time and quote back things Kim Shin and Wang Yeo have said.undefined
 * Samshin, a god character, only uses formal language with Deok Hwa, leading viewers to assume that he is superior to her in status or that she respects him greatly.undefined
 * when Kim Shin and Wang Yeo were looking feverishly for Ji Eun Tak, a butterfly was shown flying around her location. Shortly after, Deok Hwa's voice can be heard telling Kim Shin that he had found her. Previously in the drama Kim Shin has been seen trying to communicate with butterflies, as he says this is the form gods tend to take to be discreet.undefined
 * Kim Sun referred to Deok Hwa as “Joonim, Gunmooljoonim”, which means “Lord, Building Lord”, but can also be seen as a play on words as "Joonim" can also mean "God", "Christ" or "Lord".undefined
 * Kim Shin tells Ji Eun Tak that she's "the only real person here", heavily implying that Deok Hwa (as a regular visitor of Kim Shin and Wang Yeo's apartment) is not human.undefined
 * In episode 12 God reveals he was possessing Deok Hwa for a long time, then leaving in a whirl of butterflies- associated with God. He also knows things he has not been told and heard.
 * He is also the only main character whose future is not shown in the final episode. this implies that he either died at an early age or has not aged. the former is unlikely since no grave for him is shown. it is however possible that he and Kim Shin are no longer speaking or had a falling out since the future scenes are shown from Kim Shin's perspective.