Downstairs is an adult animated series that follows a cast of wacky and colourful Kopitiam stalls owners on the ground floor of an unnumbered HDB flat, in an unnamed HDB estate. Together, everyone seems to bring out the very best and worst in each other as they embark on crazy adventures throughout their little neighborhood.

When taxi driver Ah Huat's son is kidnapped, he resorts to extreme measures to raise the $1,000,000 ransom. But when the kidnapper reneges on the exchange, Ah Huat takes the most extreme measure of all: he kidnaps the kidnapper's child.