A retired hitman/gangster who both live a quiet normal life, then start to show off their skill again to save someone they love who has been kidnapped

The FL from Hometown Cha-Cha-Cha and the ML from this drama both are from medical field, one a dentist and the other a vet.

Both of them moved to a small town/secluded area from Seoul, one to open a small dental clinic while the other to take care of his grandfather's vet clinic

Both of them are not familiar with the vibe of the village when they first came