Mousetrap has quietly emerged as one of the more intriguing Korean thrillers, largely because it takes a familiar piece of folklore and turns it into an unsettling mystery about identity, deception and human nature.

At the heart of the Netflix series is an eerie Korean folktale about a mouse that eats a person’s discarded fingernail clippings and transforms into an exact copy of them. What could have remained a straightforward supernatural horror premise instead becomes a psychological thriller that constantly makes viewers question what is real.