Marriagetoxin unfolds in a world where the Poison Masters have spent centuries perfecting assassination, and the Gero family ranks among the five most powerful families in that hidden society. Hikaru Gero, heir to that infamous bloodline, has grown up far from romance or marriage, living as an elite killer in the shadows of the underworld.
When the head of the Gero family declares that Hikaru's sister will be forced to bear an heir so the bloodline can continue, Hikaru refuses to leave her future in the hands of the family. His resolve leads him straight into an unexpected encounter with Mei Kinosaki, a brilliant marriage swindler who is also Hikaru's current assassination target. Instead of eliminating Mei, Hikaru makes a startling request: he wants Mei's help finding a spouse. With Mei as his sharp-tongued advisor, Hikaru takes on the most difficult mission of his life, trying to solve the succession crisis, protect his sister, and win the ultimate marriage. The unlikely partnership between an assassin and a marriage swindler turns a deadly underworld inheritance dispute into a high-stakes chase for love.
