Ask for the name of a foreign film

Fangfang is looking for a house to live in. After hearing the news, Alex rented a house first, and then sublet a room to her through some connections. He lives next door to Fangfang and peeps at Fangfang's life with a one-way mirror on the wall. In the intense music, Fangfang began to take off her clothes, put on her training clothes and began to dance with a dynamic rhythm. Alex danced, too, watching her, looking at her face and making an expression. He lives with her through the glass. Although she was right in front of him, she was elusive. Alex was enclosed in a mirror of his own design. Alex loves the woman he longs for safety. One day, however, the secret was finally discovered by Fangfang, who witnessed his deep affection for her. Finally, Fangfang broke the mirror, which was a castle to help Alex get out of his heart. Alex finally kissed Fangfang and his heart was healed.