What does the movie "148" specifically tell?

The hero, Mike Anselin (john cusack), is a horror novelist. Mike, who takes playing tricks as his job, is an atheist through and through on weekdays. In order to finish his new book, Mike decided to stay in a haunted room for ten days, but he finally chose Room 148, the most spooky dolphin hotel in the rumor. Gerald Olin (samuel jackson), the hotel manager, takes out dozens of photos of bizarre deaths in that room over the years to persuade Mike not to take risks, but Mike is indifferent and insists on his choice. After moving into Room 148, a bizarre supernatural phenomenon made Mike completely change his outlook on life of ghosts and gods. A lot of real horror experiences have really accumulated material for Mike's new book, but the key point is that he must get out of that room alive first.