If you don't mind plot twists and character development you've seen before then this series will reliably entertain. I noticed borrowed elements from 'Goblin' and 'Doom At Your Service' to name two. The walking out of the fire scene midway through was taken from the American series 'Lucifer'.

The set up was good, but the follow through weak. For example, the main character is a demon, who it was shown must make deals periodically or perish himself. Ok, but then this was dropped and only alluded to much later. The story twists and turns don't make use of this seemingly important initial set up and constraint. What if he had had to make deals with the human present?

The first third of the episodes had more misses than hits. The balance began to shift in the middle third as we see some entertaining traction. The last third worked much better and had me binging the episodes for the next reveal. The ending seems a bit forced leaving ends loose that naturally come to mind. A big one is the female lead's father, who was not evil and made his deal out of desperation to help his wife, and yet he ends up in hell suffering eternal damnation. And the female lead expresses no concern or remorse over this inconvenient development. I was expecting something to tie this unfortunate circumstance up given all the other feel good endings we witness.