- Piotr Czarny is a charming thirty-something lawyer. He is constantly chasing adrenaline, women and parties. His goal was to fill the list of mistresses with names for every letter of the alphabet. His plan is put in jeopardy when a colleague, Olga - the only woman he's completely honest with and doesn't sleep with - gives him an ultimatum.
- 港东署ECU(Emergency Call Unit)一名紧急出动班班长,因自己没有注意到妻子遇害前打来的求救电话,而使得妻子遭到杀害。因此成为紧急指令室的一员,与拥有绝对听感但父亲被杀害的声纹分析官及同僚们一同阻止犯罪的过程与点滴。