The central twist of "My Holo Love" is the shared traumatic past of Han So-yeon and Go Nan-do. So-yeon's prosopagnosia is not a random condition but a direct result of her witnessing the murder of Nan-do's mother at the hands of Chairman Baek Nam-gyu. Baek threatened the young So-yeon into forgetting his face, which manifested as a complete inability to recognize anyone. This reveal re-contextualizes the entire series: their meeting was not coincidental but a convergence of two lives fractured by the same event.
Go Nan-do spent his life believing his mother abandoned him, a lie perpetuated by Baek to hide his crime. The discovery that his mother was murdered while trying to protect him and her research becomes the catalyst for his final transformation, pushing him to emerge from hiding and confront his tormentor. The antagonist's son, Baek Chan-sung, also undergoes a significant arc, ultimately turning against his abusive father to help the protagonists, proving crucial in the final confrontation.
The series culminates with Holo achieving a form of digital sentience and making a conscious choice to self-destruct. He understands that as long as he exists, powerful people will try to exploit him, constantly endangering So-yeon and Nan-do. His sacrifice is the ultimate act of love, freeing his creator and his friend to live a normal life. The finale sees Baek arrested, Nan-do cleared of his past hacking charges, and So-yeon's face blindness cured upon processing her repressed memories. The final scene, a wedding photo of the happy couple with a faint image of Holo smiling beside them, implies that while his program is gone, his spirit and impact on their lives remain.