After suffering life changing injuries in the line of duty, bomb disposal officer Fung turns his back on the police. But when a devastating series of bombings sweep Hong Kong, the police suspect their former ally may be involved after he is found unconscious at a crime scene. Now faced with memory loss and recalling only fragments of his former life, Fung sets out to uncover the truth and find out who he really is.

Cheung Sung-bong is a highly respected cop with a long history of success in dangerous cases. However, his past soon comes back to haunt him when a former protégé resurfaces, seeking revenge.

Fifteen years after Qing Emperor Jiaqing was crowned the country appears to be in harmony. However, fights between the imperial concubines escalate. All the imperial concubines including the emperor's beloved Yu-Yue understand this and becomes nervous when the triennial imperial concubine election approaches. Yu-Yue's position is threatened by an imperial descendant, Yuk-ying, a powerful eunuch's adopted daughter, Yi-Sun, and an experienced imperial servant maid On-Seen. They are friends and enemies in the war for the emperor's love. The four beautiful women are either friends or lovers of an imperial physician Sun Bak Yeung and a trooper Kong-Wu. Plots and lies undermine their love and friendships in the palace.

When the Hong Kong government enacts a ban on smoking cigarettes indoors, hard-core smokers are driven outside and a budding romance develops between two co-workers.

The godfather of the triad Jing Hing and his senior bosses need to select a new boss to run the daily operations of the five gangs under their control. Chuck, a lifelong member of the triad, dreams of being the elected one, but his wife wants him to leave the criminal life and spend time with their child. Wulf, a former cop, also wants take over the seat. Both will try to achieve their goal by any means necessary.

When Yip Chi-Yan, Lau Chun-Hung, Sung Yee-Long, and Cheng Chun-Hin are brought together again by an accident, their lives change irreversibly. Chi-Yan is a radio host. She and the other three were members of the same band eighteen years ago. The memory of them playing music together comes back vividly to them, and so does the pain they have all tried so hard to bury. Eighteen years ago her boyfriend, Ka-Ming, was killed in a hiking accident. Time flies, but she can never forgive Chun-Hung, Yee-Long, and Chun-Hin for failing to save Ka-Ming. As they reconnect, the four good friends and the people around them are drawn into a vortex of love they have no control over.