The Soul Mate (2018)

Jang Soo is a judo instructor who loves his daughter more than anything in the world but indifferent to the fellow neighbors. One day Jang Soo realizes that he can see Tae Jin, a ghost who used to be a devoted police officer. Jang Soo pretends he can't see or hear Tae Jin, however, Tae Jin asks him to scope out the neighborhood to solve the mystery cased he had to handle. (Source: KoBiz)