Kind of similar concept here both the drama's protagonist fight again ghostly being that enters in human beings

Here the main protagonist and antagonist is played by the same person that is Yang Se Jong. Here the both protagonist and antagonist are twin brothers who were experiment of an organization. The similarities between both the dramas is that both villains suffered a lot from their childhood and at last they died but in duel the villain was not betrayed he tried to escape from bad people instead. Also Kim Jung Eun is present in both the dramas