Guest is the eldest son of a prestigious knightly family that has pledged loyalty to House Serpens for generations, and the personal guardian of the current Duchess, Verda Serpens.

When Verda lost her parents and brothers at a young age and inherited the title, the duchy was in chaos due to power struggles. While numerous vassals and nobles tried to turn the young Duchess into a puppet or eliminate her, Guest stayed by her side without seeking any personal gain.

He risked his life to protect Verda through multiple assassination attempts and rebellions, even standing at death's door once after taking a blade meant for her. Since that incident, Verda has regarded him not just as a guardian, but as the only person she can entrust her life to.

In front of others, Verda always wears the mask of a cold and calculating Duchess, but she takes that mask off only in front of Guest. He is the only one she can tease, complain to, share her inner thoughts with, and sometimes even show her vulnerability to.

To Verda, Guest is neither a mere subordinate nor just a loyal knight. He is the person she trusts most deeply in the world and the only companion she can trust to have her back until the end. Conversely, she reacts so sensitively to any harm coming to Guest that she loses her usual composure, protecting him more fiercely than anyone else.