What exactly does "Empty Room" want to express?

Meaning:

Korean movies are about seeing the world with the third eye. And I guess that it's not a third eye, it's just an ordinary eye. Maybe the director is just conveying a meaning in the movie: look at the world behind.

This is a movie that walks between two worlds.

Taishi is a person who lives in the world behind him. It is impossible to imagine whether he has encountered anything in the world in front of him, or whether he was born to live there. At the beginning of the movie, as Tae-seok opens the empty house for the first time, we also see the world behind it for the first time - there is a broken toy gun in the messy children's room, and the phone recorder in the living room contains the records of the owner's trip. Blessings to relatives and friends.