Error Code 404 | the wonderfools.

In the small, sleepy town of Haeseong, as the whole world braces for the apocalypse like it's the end of everything, a bunch of ordinary misfits stumble into a toxic chemical accident and wake up with ridiculously flawed superpowers. Chaos? Instant. Brain cells? Gone.

Jang Mi-rae, the bold and fabulous Experiment 404, has spent years working quietly as a civil servant, perfectly controlling her dual powers (Telekinesis + Teleportation) while pretending to be just another normal girl. But then, she shifts back to the city anyone dreaded to return to, Haeseong-si.

But on the very day of the toxic incident, everything changes. Lee Un-jeong, the reserved civil servant she's been secretly avoiding, finally pieces it together and realizes she's the legendary "Error Child" he's heard whispers about for years.

What starts as Mi-rae's dramatic attempts to dodge him turns into an unwilling team-up filled with hilarious disasters, awkward moments, and growing feelings. Together with the loud and fiery Eun Chae-ni, the shy but strong Kang Ro-bin, and the forever-complaining Son Gyeong-hun, this ragtag group of flawed heroes must face Dr. Ha Won-do and his dangerous enforcers who want to drag them back into the nightmare of the Wunderkinder Project.