The usually carefree Guan Hong Yu gets accused of having murdered a whole family. To clear his younger twin brother’s charge, the team leader of the criminal investigation department Guan Hong Feng wants to take on this case, but since he’s a relative, he’s not allowed to participate in the investigation. A new team leader named Zhou Xun is assigned and ends up seeking Hong Feng’s help.

Zhou Xun and Hong Feng, as his “consultant”, uncover a number of cases together. However, Hong Feng has a secret: one of the twin brothers has a fear of a dark phobia, so the “Hong Feng” appearing at the police station during the day and at night is actually not the same person. Together, the twins secretly try to find out the truth about the “family extinction murder case.”

白夜系列之《白夜破晓》讲述了被灭门惨案牵连的双胞胎兄弟关宏峰和关宏宇（潘粤明 饰），与隐藏在暗处的犯罪组织对抗，联合多方力量，追查“2·13灭门案”真相，最终光明战胜黑暗的故事。