I’m not sure if this movie is japanese or chinese, but the story is like there will be a ghost living in the lift of their apartment, and there will be this little boy who accidentally saw it and the ghost will start trying to take the boy together with it because it started to see the boy as it’s son. Please I hope I can find the movie.
Dark Water (2004)?
https://youtu.be/1Lfzcd0zV5A
No it’s not, I’ve checked.