The drama stars Tay Ping Hui, Qi Yuwu, Elvin Ng, Joanne Peh, Chris Tong, and Tracy Lee in the main roles with a large ensemble supporting cast.
[3] Investigation officer with the forensics team and Yee Tat and Yongmei's family friend (Deceased - episode 14) The series showcases various kinds of cases police units deal with, from complicated and sensitive cases such as illegal immigrants and hostage situations to textbook crimes such as arson, drug trafficking, rape, and burglary.
Five years ago Yee Tat failed to crack a case in time and the suspect strangled his daughter before being apprehended.
This case and the burden of having to juggle professional commitments with family life become a source of guilt for him throughout the series.
It turns out that he had joined the police force with his older brother but the duo had a falling out over differing views and he is deeply troubled by it.
Kampong Java NPCO Sgt Teo Kwee Xiang is well known for his incessant griping and complaining, which annoys his colleagues to the point where his team leader SSI Chao Kok Hung was about to have him transferred.
Kwee Xiang softens his approach when he realises that Xiao Yang had joined the police force to escape her parents' iron hand but had come to love it.
As the summit draws ever closer, preparations are again thwarted when Xin Yi becomes "collateral damage" while investigating a seemingly mundane kidnapping and burglary case and is held hostage by a mysterious Korean-American man.
Her colleagues soon find themselves dealing with a complicated web of firearms trafficking and cover-ups involving an Interpol-listed criminal syndicate.
In the epilogue (with a one-year time lapse), it is revealed that Kwee Xiang has been promoted to staff sergeant and deputy team leader, Xiao Yang earned a transfer to the investigation branch and became Yew Jia's new partner; she and Kwee Xiang are now an item.
Prior to filming, it was confirmed that Tay Ping Hui and Tracy Lee would not be returning and Rui En, Pierre Png, and Li Nanxing portrayed new characters.