Can someone tell me the name of this movie, The mom gets brutally murdered, and the son gets kidnapped so the dad goes on a long journey to find his son with the help of a mentally ill women

Aman lives on the twelfth floor of an apartment building. every morning he takes the elevator down to the lobby and leaves the building. in the evening, he gets into the elevator, and, if there is someone else in the elevator -- or if it was raining that day -- he goes back to his floor directly. otherwise, he goes to the tenth floor and walks up two flights of stairs to his apartment.