Synopsis：To fulfill her late mother’s last wish and become a legendary poison master, Yana Yawner must obtain the Gayton family’s heirloom Poison Manual—yet the only way to access it is to marry into the Gayton household and bear an heir. At the same time, Zackery Gayton is desperately searching for the Divine Doctor to cure his adopted son’s mysterious illness. Their goals lead them into a marriage of convenience, where misunderstandings, hidden motives, and unexpected dependence slowly turn into trust and genuine affection. Together, they unravel deadly secrets and heal old wounds, eventually finding true love and lasting happiness as a family.