Koo Chi-Ming (Alan Tam) is a life-insurance investigator who while driving to his engagement party, loses control of his car almost running over a young girl, Siu-Yu (Ni Shu-Chun). Later upon arriving at his party he and his father (Bill Tung) begin being henpecked by his mother (Tang Pik-wan) and his fiancée Ivy (Cecilia Yip). Later after the party has ended, everyone decides to have some fun with a Ouija board by attempting to talk to a spirit. Chi-Ming's little brother explains that after they are finished they must send the spirit back, otherwise the person last holding the saucer will be haunted by the spirit. Elsewhere, Siu-Yu is on the roof of her apartment with her goddaughter Mimi drying clothes when Siu-Yu notices that Mimi is very close to the edge rushing forward to grab her, Siu-Yu's foot accidentally lands on a skateboard which sends her over the edge of the roof to her death. Back at the house, as soon as Siu-Yu dies, the saucer begins to show signs of movement and points out the name of the recently deceased Siu-Yu. The saucer then begins to circle violently around the board and everyone is thrown backwards, apart from Chi-Ming, who holds on until the last movement at which point the saucer flips over to reveal a small spot of blood indicating he will be haunted.
The next day at work, Chi-Ming is handed two cases to investigate by his boss (Philip Chan). The spirit of Siu-Yu makes sure that he gets her case by switching the files. While looking through the case file, Chi-Ming notices that the name of the deceased is the same as the one spelt out on the Ouija board. After visiting the deceased girl's apartment, he realises that the girl who died was the girl he almost ran over the night before. Upon returning home the ghost of Siu-Yu appears to Chi-Ming and tells him that her death was an accident, and to pay the insurance money to her goddaughter Mimi.
At work Chi-Ming is about to write up his report but his boss intervenes telling him to say that the girl committed suicide. Later, Chi-Ming tells her that he can't help as it is his boss's decision. After hearing this Siu-Yu begins playing pranks on Chi-Ming's boss causing him to fire Chi-Ming. Chi-Ming takes losing his job hard, ending with him being thrown in jail only later to be bailed out and re-hired by his former boss who has had a change of heart after Siu-Yu being haunted again.
Now a free man and with a promotion, Chi-Ming begins a romantic relationship with Siu-Yu much to the dismay of his girlfriend who along with his mother hires an exorcist Dr. Han. At Chi-Ming's apartment Dr. Han explains that while he is performing the exorcism the front door which he calls "the door of life" can't be opened as this will cause the "door of death" to open. He also instructs Ivy to keep Chi-Ming away from his apartment during the exorcism.
Ivy takes Chi-Ming out to a nightclub to distract him, but while watching a dance performance he spots Siu-Yu on stage and in great distress. At the same time, in Chi-Ming's apartment, Dr. Han summons Siu-Yu which causes her to disappear in front of Chi-Ming. Chi-Ming rushes home to find Dr. Han in the middle of the exorcism. Rushing to help Siu-Yu, he triggers the opening of the "door of death". Dr. Han runs away, while everything in the room is sucked out the window, along with Chi-Ming and Siu-Yu. Grabbing the balcony railing Chi-Ming hangs on but Siu-Yu is sucked into the sky. Trying to follow her he jumps, but falls down 18 floors onto a parked car. After recovering in the hospital, Chi-Ming returns to where he first saw Siu-Yu, in hope of finding her. He walks out onto the road, nearly being hit by a car. Looking through the window for a split second, he thought the female driver was Siu-Yu, but then notices it wasn't and lets her drive away. With an emotional look, he removes his glasses and looks up into the sky with a smile.Alan Tam as Koo Chi-Ming (古志明) – an insurance investigator who falls in love with a female ghost
Joyce Ni Shu Chun (倪淑君) as Chang Siu-Yu (張小瑜) – a girl who died in an accidental fall, became a ghost and begins to haunt Chi-Ming
Cecilia Yip as Ivy – Chi-Ming's controlling girlfriend
Tang Pik-wan as Chi-Ming's Mother
Bill Tung as Chi-Ming's Father
Cheng Mang-Ha as Mimi's Grandmother
Tien Feng as Dr. Han – a Taoist priest who tries to exorcise the ghost Siu-Yu
Lung Tin-Sang as Dr Han's assistant
Billy Lau as Chi-Ming's colleague
Philip Chan as John Tang – Chi-Ming's boss
The film is based on an original story by Raymond Wong. Wong's inspiration for the film came on a trip to worship his ancestors, while his family was making preparations. Wong was wandering around nearby and came upon a grave. There was a picture of a girl on the tombstone. She was quite pretty so he stopped to look at the picture when suddenly he felt a chill go down his spine. He was afraid because as he stared at her, he thought, "she might haunt me this night". Wong then walked away and rejoined his family. That night, he tossed and turned in bed thinking about what had happened and came up with the story. Wong and his childhood friends used to play séance, so he decided to include this in the storyline, too. It was decided that the movie should have a French-language title rather than an English international title, meaning "Spirit of love".
Alan Tam was quickly chosen for the starring role but the lead actress was undecided. Maggie Cheung was originally meant to play the role of Siu-Yu, but was rejected by director Po-Chih Leong.
At the Golden Horse Awards in a cocktail reception the director spotted a young girl called Joyce Ni and instantly wanted her to play Siu Yu, however she had never acted before. In an interview, co-producer Raymond Wong said that he respected the director's choice and casting her was the right decision.
Filming began in late 1982 under the direction of Po-Chih Leong, director of the generally well-received Hong Kong 1941. According to Ringo Lam around one-third of the film had been shot when Leong resigned after arguing with producer Karl Maka. In need of a quick and inexpensive replacement Maka gave the previously unknown Ringo Lam his big break. Later in an interview Lam explained, "I have no choice, I need food, so I do the best I can ..." Lam received sole directing credit for the film.
The movie's main song (Chinese: 幻影; Jyutping: waan6 jing2) known in English as Illusion, or sometimes as Phantom or Mirage, is used throughout the movie in a music box and is also used in the ending credits. It was composed by Chinese composer and music producer Lam Manyee, written by Lam Man-Chung and sung in Cantonese by lead actor Alan Tam. A version in Mandarin, also sung by Alan Tam, was later released under the same Chinese name.
The film received mainly positive to average reviews with one critic at LoveHKFilm.com stating "This isn't a spectacular film, but classifying it as above-average HK Cinema is more than appropriate." Hong Kong Digital described it as "run-of-the-mill" but with "modicum charm," while another review at So Good... calls it a "true Hong Kong product" with a "stylish tension-filled ending". On the Chinese movie review website, Douban, it received an average rating of 7.2 out of 10 based on 275 user reviews, and also made the list for the 10 Best Chinese Ghost Movies on Screen Junkies by coming in at number 2.
The film was nominated at the 4th Hong Kong Film Awards, in the "Best Original Film Song" category. The song that attracted the nomination was "Illusion", which had music by Lam Manyee, lyrics by Lam Man-Chung, and was sung by lead actor and Cantopop singer Alan Tam. The award ultimately went to "A Chance Encounter" (偶遇), the theme song of 1984 movie A Certain Romance (少女日記), sung by Samantha Lam.
Producer Raymond Wong remarked in an interview that it was "a box office hit". The movie ran in theatres from 15 December 1983 to 4 January 1984 and grossed a total of HK$14,102,667 million.
In 1990 the film featured as part of Channel 4's "Chinese Ghost Story" season introduced by Jonathan Ross, being played alongside similar movies in the genre such as Encounters of the Spooky Kind, Zu Warriors from the Magic Mountain, Mr. Vampire, Spiritual Love and Rouge. The film was also shown 29 May 2010 at University of Toronto as part of Asian Heritage Month.
The film has been released on VHS, Laserdisc, VCD, and DVD. It has been digitally remastered for Region 2 DVD (2007) by Universal Pictures Japan and for VCD and Region-All DVD (2008) by Joy Sales (Hong Kong).