How do we know what we know? More importantly, how do we know anything when the supposed evidence consists of absences? Does a cat exist that we never see or hear, and all we do is fill its bowl with food and clean the litter box regularly? Is a charmer’s glib confession that in order to feel alive he burns greenhouses every couple of months enough proof to convict him of these crimes – and of worse ones? And when a loved one vanishes, is her absence proof that something horrible has happened? Does Lee Jong-su (Yoo Ah-in) make himself believe that something is there, or does he make himself forget that what he is looking for actually doesn’t exist – as with the tangerine in the pantomime his friend Hae-mi shows him?