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在一次行动中，女警白锦曦结识了神秘的男子韩沉，两人之间产生了不少的误会。白锦曦后来才知道，原来韩沉亦为刑警，之后更成为了自己的搭档，共同破获奇案。在此过程中，白锦曦见识到了韩沉高超的智商和惊人的魄力，韩沉亦为白锦曦的巾帼不让须眉而倾倒，两颗心的距离越靠越近。 然而，曾经的一场事故令韩沉失去了部分记忆，亦使得他和记忆里的未婚妻天各一方，为了守护这段回忆，韩沉下意识的逃避着自己对白锦曦产生的感情，最终，白锦曦的坚持和深情让韩沉决定敞开心扉。但在此之前，韩沉还有一件必须要做的事情，那就是查明自己失忆的真相。
The Black Shield team investigates the Alphabet Syndicate as its remaining members prepare for a major operation.
A dangerous attack leaves Han Chen and Bai Jinxi injured as the Alphabet Syndicate begins a new campaign of terror.
The Alphabet Syndicate kidnaps two members of the Black Shield team, forcing Bai Jinxi to make an impossible choice.
A diary from Bai Jinxi's former mentor provides a crucial clue about the mastermind behind the Alphabet Syndicate.
The Alphabet Syndicate carries out a series of attacks while the Black Shield team races to prevent a larger threat.
A hostage crisis aboard a cruise ship exposes the identity of one of the Alphabet Syndicate's most dangerous members.
Bai Jinxi awakens to find herself trapped by the Alphabet Syndicate and begins fighting to escape.
Han Chen and Bai Jinxi struggle to survive as the cruise ship falls into chaos and the Alphabet Syndicate's plan unfolds.
Bai Jinxi and Han Chen investigate the origins of the Alphabet Syndicate while their relationship draws unwanted attention.
Han Chen and Bai Jinxi's relationship deepens as Bai Jinxi prepares to infiltrate the Alphabet Syndicate.
Bai Jinxi discovers that the Alphabet Syndicate knows her true identity and prepares to take control of her fate.
The truth behind the Alphabet Syndicate and the identities of those involved finally comes to light.
