Cold Blood Warm Heart

Tsui Wing-pong (Adam Cheng) and Tsui Ka-lap (Gallen Lo) are adopted brothers. Wing-pong was sent to the Tsui family when he was very young because his biological father abandoned the family during a difficult period. Over the years, Wing-pong bears a deep grudge against his biological father, who is the owner of the Yip family bank. At the same time, the Yip family had a dark past and some dangerous secrets.

Lo Chi-kin (Julian Cheung) is the new head of Wing-pong's division at the police station. He has a sister Rebecca Lo Wai-fong (Christine Ng), for whom Wing-pong had an unrequited love. Chi-kin and his best friend Yip Sing-hong (Louis Koo) fall in love with Fong Hau-yung (Adia Chan), who works at the bank run by the Yip family and so was she. However, Chi-kin and Hau-yung were forced to give up on each other, due to some circumstances, and Chi-kin ends up marrying Cheung Suet-ying (Jessica Hsuan), who is actually in love with Wing-pong's brother, Tsui Ka-lap.

During one murder case, Wing-pong was falsely accused as the murderer and was sent to jail. Following his release, he discovered that his brother, Ka-lap, was the real murderer and was also involved in many other criminal activities. It was later revealed that Ka-lap had the backing of the Yip family to commit the crimes he did. Seeing that there is no other choice, Wing-pong embarked on a dangerous journey to capture Ka-lap and to investigate the dark secrets that the Yip family held, but not without the unforeseen consequences of the sacrifice that the major characters had to make.

• Adam Cheng as Tsui Wing-pong (徐永邦), the main protagonist of the series, the adopted son of the Tsui family whom was abandoned by his father, banking tycoon Yip Sing, during his youth. Wing-pong was originally a police sergeant, but was later framed by his adopted brother, Tsui Ka-lap, for the murder of corrupt police superintendent Tai Shu-piu and was imprisoned. Wing-pong later successfully appealed and was released without charge, and afterwards, collaborates with his niece Yip Hiu-fung and nephew Yip Sing-hong to rescue Wah Yip Bank, counter-working against Ka-lap.
• Gallen Lo as Tsui Ka-lap (徐家立), the main antagonist of the series, a senior police inspector and eldest son of the family. With the backing of Wing-pong's half brother, Yip Wing-cheung, Ka-lap frames Wing-pong for the murder of his superior officer, Tai Shu-piu, who had been scheming with Ka-lap and Wing-cheung to smuggle drugs. Ka-lap, who had been taken advantage by Wing-cheung the whole time, manages to sabotage the latter, and seizes half of the stocks of Wah Yip Bank, before murdering Wing-cheung.
• Julian Cheung as Lo Chi-kin (羅子建), a senior police inspector and Wing-pong's superior officer. Chi-kin and Wing-pong originally disliked each other, but after the case of the murder of Wing-pong's half brother Yip Wing-kei where the two of them were suspended from duties, they settled their differences.
• Louis Koo as Yip Sing-hong (葉承康), Wing-pong's nephew and Chi-kin's best friend. Sing-hong and Chi-kin both had a crush on Fong Hau-yung, and ends up dating her. However, Sing-hong breaks up with Hau-yung to protect her when he discovered the secret that his father, Yip Wing-cheung, was the culprit behind his uncle, Yip Wing-kei's abduction, and Sing-hon was also forced by Ka-lap to betray Wai Yip Bank.
• Christine Ng as Rebecca Lo (羅惠芳), Chi-kin's older sister who is an instructor. She develops a relationship with Wing-pong and after a full of setbacks, eventually marries with Wing-pong.
• Adia Chan as Fong Hau-yung (方巧容), an employee working at Wah Yip bank. As a child, Hau-yung suffered from septal defect. Although Chi-kin and Sing-hong fell in love with Hau-yung at the same time, she loved the former.
• Jessica Hsuan as Michelle Cheung (張雪凝), Tsui Ka-lap's ex-girlfriend who almost ends up marrying Lo Chi-kin, even though she is still very much in love with the former.