Story is quite complicated but shortly:

Guy sees ghost its why he works as exorcist
Once guy find woman ghost and they start live together and do exorcism together.
Romance between young woman ghost and young male exorcist.
Its well played romantic comedy with great chesmitry of main actors.

At mine list I never gived yet overall score 10 stars.
Meaning these 9.5 this drama got shoots it right at peak of dramas I ever watched.
If you want some fantasy drama comedy its way to go.