Movie synopsis

Hi, please help to correct my this synopsis if there are any mistakes.

Lin Yi’s paranoia caused increasing tensions with her boyfriend. One day, the police come to her house to inform her that her boyfriend has died a long time ago. Chen used torch light to signal with a mysterious man living at the apartment opposite every night. Not long after that, Chen is realized that the man has a girlfriend. Then, Liu suspected that the lady living opposite his apartment is being illegally detained. But when he called the police, there is no one in the apartment.