Her Personal Bodyguard Is a Hidden Master

A hidden master returns to civilization with two goals: avenge his slaughtered family and honor a childhood betrothal. When an arrogant heiress rejects him, her adopted sister steps in to take her place. What starts as a marriage of convenience quickly turns perilous. With unmatched martial and medical skills, he protects his new wife from danger, sparking real love. But as he uncovers the truth behind the massacre, can they survive the enemies in the shadows?