Kathleen is a professional DNA Hunter who entered the field after her fiancé, Youji, perished in a tragic mountaineering accident. Driven by the goal of having a child with Youji through genetic reconstruction—a project demanding substantial funding—she pursues high-paying work. This path leads her to specialize in covertly obtaining genetic material from celebrities.

Her role involves seducing high-profile individuals to secure their sperm for clients desiring children with specific idols who refuse cooperation. Kathleen employs various tactics to achieve these covert extractions, operating as a skilled practitioner in her high-stakes field.

Her background centers entirely on this personal loss and the subsequent career choice fueled by the urgent need to finance her reproductive objective.