A series of poisonings on rainy nights in Bincheng: a perfect crime with no clues to follow.
Criminal Investigation Team: Song Ce'an × Lu Qingyan, hunting down the culprit side by side.
And a fated bond between the villains: professional killer Wu Qinglan × chemistry genius Li Xun. They use poison to take revenge, depend on each other for survival, and fall together into the abyss.
Theme: Using murder to avenge the dead leads only to capture; justice and deep love take different paths to the same end.
