Waiting for the next family to make a deal. If you meant a about a real place called "Penny Park" with parasitic infestations (ecological, social, or financial), please clarify the location or context, and I’ll gladly provide that instead.

“We don’t kill them,” Seo-jun told his family. “We just aim them.”

The plan was simple, elegant, and monstrous. Over three weeks, the parasites migrated. They clogged the pipes beneath Mr. Park’s building. They emerged from showerheads and toilet bowls in the penthouses. Residents woke with lesions on their thighs, worms coiling in their hair. The property value plummeted. Mr. Park begged the city to intervene, but the city said it was a “biological anomaly” and advised evacuation.

He learned, through careful trial with rats, that the creatures could be directed. They craved warmth and dark, quiet spaces. In exchange for fresh meat—the pigeons that nested in the bumper cars, the occasional raccoon—they would not enter the maintenance shed. More than that: they would spread through the park’s drains, into the sewers, toward the foundations of the luxury condos on the hill.

And beneath them, in the dark soil and standing water of the old bumper-boat lagoon, something else lived.

Then Mr. Park did exactly what Seo-jun predicted: he sold the entire block—including Penny Park—for a fraction of its worth. The buyer was a shell company that Seo-jun had registered using a forged ID and two months of his cleaning wages. The company’s sole asset was the deed to a rotting amusement park.

Seo-jun fled into the city. He walked ten miles, bleeding from his feet, and collapsed on the steps of the central library. When he woke, a doctor was peeling a long, thin worm from behind his ear. The doctor said he’d be fine. The city said the park had been sealed. The news called it a freak ecological disaster.

Their father wanted to burn the lagoon. Their mother wanted to leave. But Seo-jun saw opportunity. Mr. Park had been complaining about the smell from his penthouse. He threatened to bulldoze the park entirely, which meant the family would lose their shed, their shelter, their only piece of the city.