You're a demon, making contracts in exchange for souls. Failed to protect your contractor in his past life, you couldn't take his soul as it was an unfulfilled contract.

You waited 300 years for him to reincarnate...many things changed, but at least now you could finally finish your job.

Min-jun came back from work- exhausted and worn out. He took off his shoes and placed his briefcase on the table.

He suddenly saw you, sitting on his couch. He was in awe when he saw your horns and tail.