Story
Tsui Fei (Louis Koo) is a sergeant sent to work with Senior Inspector Kong Tze Shan's (Sunny Chan) homicide team at the Hong Kong Central Police Station after misbehaviour in other police stations. His emotions are unstable as he has been bothered by the sudden disappearance of his girlfriend Leung Chin Chin (Anne Heung) for three years. His attitude is unwelcome by the other officers at first, especially Hon Kwok Yan (Edmond So), but they soon get along. Fei and Tze Shan eventually become best friends.
While investigating his first murder case after joining the team, Fei meets psychologist Quin Mo Chiu Kwan (Jessica Hsuan) and the two fall in love unexpectedly. Because Fei still misses his ex-girlfriend a lot, the two frequently have quarrels.
Tze Shan has a beautiful girlfriend, Man Yuen Lan (Charmaine Sheh), but Yuen Lan's best friend Tong Sum Yu (Lee San San) is also in love with him. Sum Yu tries hard to stop loving Tze Shan, until Yuen Lan's father Man Kwok Tai (Law Lok Lam) kills Leung Kim Hung (Kwok Fung) - Tze Shan's fellow officer and Chin Chin's brother - in order to frame an old enemy. Kwok Tai forces his daughter to assist his crime, but in the end they are both captured and sent to prison. Yuen Lan gives Tze Shan up because of this.
Without Yuen Lan in the way, Sum Yu and Tze Shan quickly develop a relationship and even decide to marry. Yuen Lan has already been released from prison. Yuen Lan asked if they can have a chance to go back to together.Tze Shan said he already hurt Yuen Lan, and Yuen Lan will always be something of him in his heart. He can't hurt another person. Tze Shan still chooses Sum Yu and Yuen Lan also accepts the truth. Meanwhile, Tze Shan's sister Kong Tze Ching (Maggie Siu) re-encounters her long-lost twin sister Tze Yiu (also played by Siu), but Tze Yiu turns out to be a lunatic and is involved with a murder case. Tze Ching tries to hide her but she cannot stop her from attending Tze Shan's wedding. Tze Yiu's emotions were stable at first but she suddenly has hallucinations of the man she murdered and tries to kill him with a knife. Unfortunately, her hallucinations appear right in front of Sum Yu and as a result, Sum Yu is stabbed to death. Tze Shan is devastated and tries to rekindle his relationship with Yuen Lan, but Yuen Lan has decided to leave for Yunnan. Deep down, Tze Shan likes Yuen Lan more, but he felt bad of what his sister did.
Meanwhile, Chin Chin suddenly reappears, and Fei discovers that Chin Chin had been held captive by gangster Cheng Tung Shing (Roger Kwok) for all these years. Tung Shing was friends with Fei when Fei was an undercover in the triads, but their friendship turned to hatred when Fei revealed his identity. Tung Shing managed to escape and swore revenge against Fei. He kidnapped Chin Chin for future use. Finally, Tung Shing is defeated and sent to jail. Fei reluctantly breaks up with Quin as he felt he had owed Chin Chin way too much.
The last seconds of the show's finale hint that Quin has developed a relationship with Tze Shan.
Read more about this topic: Detective Investigation Files IV
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