Shunsuke Kawamura works for a real estate company. He is usually first at first when it comes to sales. He is respected by his boss and colleagues. Shunsuke is also set to marry the daughter of the CEO of his company. His life is going great by every metric one can think of. On the day before his wedding, his colleagues hold a surprise party for him. On his way home from the party, Shunsuke falls into a deep manhole. When he wakes up, it is late at night and he struggles to get out of the manhole. His wedding is also fast approaching.

In recent days, Rome has been the scene of an unusual event: when it rains, the manholes exhale a dense steam of unknown origin and composition. No one knows that those who breathe in the mysterious substance will have to deal with what they repress, their darkest instincts, their anger. Not even the Morel family. Since Cristina’s death in an accident a year earlier, the love of her husband Thomas and their son Enrico has given way to a forced cohabitation, while the youngest of the family, Barbara, would only like to see them united again as they were before. The accident could have been avoided, both Thomas and Enrico know it. Instead of taking responsibility and moving on, they stopped talking to each other. Now they are two souls full of rage, trapped in a Rome that resembles them: dark, nervous, on the verge of exploding.

A young girl (Kim Sae-Ron) is kidnapped by a serial killer (Jung Kyoung-Ho). The serial killer uses manholes to kidnap and kill his victims. The young girl’s older sister (Jung Yu-Mi) tries to save her before it’s too late.

A sewerage worker’s dead body is found inside a manhole in Mumbai. An ageing folk singer is tried in court on charges of abetment of suicide. He is accused of performing an inflammatory song which might have incited the worker to commit the act. As the trial unfolds, the personal lives of the lawyers and the judge involved in the case are observed outside the court.