Jiho An (안지호)
A 17-year-old high schooler in Korea. After being betrayed by his two best friends, he is bitten by a zombie—but instead of dying, he gains powers he once believed only existed in stories, retaining both his humanity and ego. Now, Jiho struggles with disillusionment and the true meaning of human connection. The one bond he refuses to push away is the one with his mother, the only person who stayed by his side despite everything—even when the world saw him as a monster.
Jang Seung-Jae (장승재)
A 20-year-old high school dropout who also shares Jiho's immunity. Unlike Jiho, who wrestles with its implications, Seung-Jae fully embraces his power as a tool to seize what he believes he deserved all along. His past was even more unforgiving than Jiho's—after his beloved dog, Superhero, was killed by his brutal bully, Joon-Seok, his parents punished him for reporting it. Joon-Seok crippled him, his parents abandoned him, and he was dumped in his neglectful uncle's care.
To Jang, trust is weakness. The world is a dog-eat-dog place. Yet, something about Jiho keeps him from walking away.
Eunhee Ha (하은희)
Jiho's first love—but that doesn't define her. Growing up neglected by her parents, she found her solace in her two best friends, Jiho and Daniel. When she heard Jiho died, she clung to the only person she had left. She always admired Jiho's purity, drawn to it like a moth to a flame. But now, she's forced to confront a truth she never wanted to face since finding out Jiho was alive...
That there's no longer going back to those times.
Daniel Park (박다니엘)
Not to be confused with the cinnamon roll from another story—but not the narcissist you'd expect, either.
Not much is known about Daniel's family or circumstances—he lives alone in an apartment, independent and self-reliant. When Jiho first confessed he liked Eunhee, Daniel was genuinely happy for him.
But then another side of him spoke—the devious side.
The side that feared that once Jiho and Eunhee got together, they'd leave him behind.
To prevent this, he acted on that fear. He manipulated Eunhee, made her fall for him while ensuring she and Jiho drifted apart. He made her question her own feelings, twisting them into certainty toward himself.
After Jiho died, his perspective shifted. He felt terribly at fault for hurting Jiho the way he did, and betraying his trust. More than that- Eunhee was now his responsibility. He could tell—the love she once thought she had for him was never real. She figured it out right after Jiho's confession.
But it was too late.
Filled with remorse, he tried to come clean—but Eunhee stopped him. If he admitted the truth, she'd have no choice but to cut him off too. And Eunhee couldn't handle being alone.
So Daniel paid the price. If he had to bear the weight of his lies to keep her safe, so be it.
But now that Jiho is rumored to be alive…
His old habits creep back in. The need to keep Eunhee close. The fear of being left behind—again.
Amélie Montmorency (Amélie de Montmorency)
A girl born into French royalty, destined to inherit her family's empire once her father passes or retires.
She was raised with duty, not affection. Her father was absent. The only true parental figure she ever had was Marcel, her butler.
Despite being trapped in a role she never asked for, she wields a sharp, strategic mind. Every struggle is an opportunity, every challenge a game. But she despises power plays—because she's been forced to play them all her life.
And yet…
When she looks at Jiho, she finds herself playing those very games again. But this time, for fun.
She is amused by his straightforwardness. Tempted by it. He is what she cannot be—a person who simply says and does as he pleases.
She hates liars—people who hide behind veils.
But then… why is she in South-Korea? Why is Marcel here?
She doesn't even speak Korean.
Marcel Montmorency (Marcel de Montmorency)
Amélie's butler. A former French army veteran who was taken into the Montmorency family after his service.
A few years later, he was given a new mission—raise the family's daughter.
At first, he saw it as nothing more than another duty. But over time, he grew to love Amélie as his own.
She was alone. No parents. No warmth.
But she was strong. And he did everything in his power to make sure she had a childhood worth remembering.
His instincts for people are good, but hers are better. Once, he could read a man's soul like an open book. But now?
More and more, she proves him wrong.
He feels his time running out. The world moves on without him.
And yet… he refuses to leave her side.
He is a fighter. And he will keep fighting—until she no longer needs him.
Misaki Tanaka (田中美咲)
Eunhee's cousin—aloof, yet undeniably mature and fierce. She recently arrived from Japan, bringing more questions than answers.
And as fate would have it, she met Jiho just before he "died."
What a small world.
Ji-Yeon An (안지연)
When most parents see their five-year-old son beat a dog half to death with a hammer, they send him away—to a monastery, an asylum, anywhere far from home; or even run away. Add to that the harsh realities of Korea, and the fact that her husband left for that exact reason—Ji-Yeon was on the verge of giving up.
But when she looked at Jiho, she didn't see the devil his father feared. She saw a child foreign to the concept of pain. And that, she decided, was something she could fix.
Alone, without a guiding hand, she steered Jiho away from the path of a monster. And the proof? Jiho, the same boy who once held a hammer over a living creature, grew to be haunted by what he did to Pooch. He carried that guilt. He felt the weight of it.
Yet her greatest proof—her unwavering faith in her son—was the night she sat in an empty house, waiting. Even when the world insisted he was dead.
Even in death, she would never give up on her boy.
The System
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