The series takes place a year after the 2nd installment.

Chan Siu Sang is single and all alone, his old love Chu So Ngo married the doctor that treated her son and left the police force. Then he meets Wai Ying Zi, a rookie police officer that is under Chan Sam Yuen Police Traffic Department unit. The two get off on the wrong foot due to misunderstandings. Wai Ying Zi who is eager to show off her skills seems to get into a lot of trouble. She is deemed reckless and rash. Later on, Ying Zi joins Siu Sang's CID unit which leads to the two bickering non-stop. After Siu Sang saves Ying Zi life on one of their investigations she learns to respect him and the two become friends. Chan Sam Yuen is promoted to the head of the Police Traffic Department. She and Ching Fung are also now parents to a pair of girl/boy twins, but their marriage is not as happy as it seems as the two continue to have quarrels in their marriage. With marital problems at home, Sam Yuen becomes a cold, unreasonable and mean boss at work. When a case similar to the psychotic serial rapist in the last series arises Sam Yuen starts feeling threaten and insecure even though the culprit Bao Gwok Ping is still locked up in jail. It seems Bao Gwok Ping has been communicating with someone on the outside who agreed to take on his split personality persona and continuing his crime spree. Due to Sam Yuen's carelessness her son is kidnapped and killed by the new culprit. This causes Sam Yuen and Ching Fung marriage to be in further jeopardy when he blames her for the death of their son.

Honjo Hidehisa (Nakai Kiichi), a successful lawyer in his 50s, is found to have an early onset of Alzheimer’s. He forgets memories which he ought to remember and constantly recalls those that he wants to forget. One incident he wishes to forget is the death of his son in a car accident. The culprit still has not been caught. Honjo has not faced up to the past until now. He has only thought of work and neglected his new family. But as he gradually begins to lose his memories, he devotes his remaining life to exposing his past and taking on his final case.

Malaiwan is a beautiful and charming woman who's high-flown, has singing and acting talent, and became a stage actress. She's the famous star of Bangkok Naruemit theatre, but everyone hates her for being mean and arrogant. One day, Ward, a girl who came from a rural area, threatens to make Malaiwan lose everything she has, but she will do anything to protect it. Later, a fire is accidentally setted in the theatre, killing Malaiwan. Her spirit stays to haunt the place where she died.

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This series is about a man, Hong Siu Long who is from 21st century-Hong Kong travels back into the past during Warring States Period in China. Unfortunately, the time machine comes into an error when he is being transfered into the past. As a result, Hong Siu Long comes to the period which is three years earlier than he is supposed to be and therefore, he can't go back to the future. In effort to go back to the future, he tries to keep the history goes as it is supposed to be.

Sick of her younger sister An Qiao's spoiled antics, Zhou Yu Qin abandons An Qiao at the Lantern Festival driving her mother Ruo Lan crazy. Ten years later, Yu Qin is now the head of the Zhou family and An Qiao, now renamed Liu Liu, returns. Liu Liu not only gains the love of the whole Zhou family but also makes the family lose their trust in Yu Qin. Liu Liu's return also sparks romantic interest from Yu Qin's husband, Dai Yong Cheng, and Zhou family's son, Zhou Tian Qi. Yu Qin, finding Liu Liu to be suspicious, does some investigation and discovers that An Qiao is already dead! Then who is Liu Liu?

Several princesses with different temperaments reside in the palace of King Jing of Moxuan. King Jing favors Princess Yi for her gentle and kind demeanor. Not one to fight with others, she is virtuous, often sympathetic to the mansion maids, never beating nor scolding them. For her part, Princess Yi wholeheartedly returns the King’s affections.

King Jing later comes to value and admire the Princess for withstanding various hardships and courageously facing life and death challenges. Conversely, when King Jing faces adversity, Yi wisely finds a solution that brings him time to win the final victory.

Visiting Queen-Dowager Wangjin too recognizes the worth of the Princess, decreeing her a full concubine. Jealous of Concubine Yi, the other princesses plot her demise. To keep the peace in the palace, Yi remains tolerant for a time. But after repeated persecution, she retaliates by ridding the kingdom of these harmful women.

Now both she and King Jing play roles in court affairs that attract discontent. Cheng Wang, envious of King Jing and thinking of him wholly inferior to himself, overestimates his talents. Trouble looms as he plots to kill his rival, steal the throne and declare Yi his Queen.

Gamagori Futaro has been poor since the day he was born. As a child his recklessly wasteful and abusive father sunk the family into debt and disappeared, leaving Futaro and his sick mother to fend for themselves. With no money to pay for medical treatment for his ailing mother, she eventually died. After her death Futaro became obsessed with money and willing to do anything for it. Several years pass and Futaro finds himself working at "Mikuni Shipbuilding" where he meets the company president's daughters Midori, who was his former classmate, and her younger sister Akane, who is disabled, and like Futaro, has a scarred face. In a plot to acquire their fathers company, Futaro begins to get close the sisters..