What role does the glum faced man play in the story in hearts and hands?

In "Hearts and Hands" by O. Henry, the glum-faced man serves as a pivotal character that highlights themes of deception and societal roles. Initially appearing as a prisoner, his demeanor and interactions with the other characters reveal deeper complexities regarding identity and circumstance. His true role as a con artist, juxtaposed with the more naive and optimistic character of the woman in the story, underscores the irony of appearances versus reality. Ultimately, he embodies the story's commentary on the nature of relationships and the masks people wear in society.