If you loved Asura: The City of Madness, try The Flu
A bridge between a film you've already seen and one most people haven't. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by Kim Sung-soo, and they both carry the dread, raw mood tags, and they sit in Action / Thriller territory. If that's the register that drew you to Asura: The City of Madness, the second film will land in a comparable space — through a different lens.
dreadraw
What The Flu is
Seoul, rainy season, sirens blaring. A crowded hospital overflows, a virus spreads, the government readies lockdown. Kim Sung-soo shoots with frenetic urgency.

