Fingernails

Some years prior to the film, a test costing one fingernail that determines whether couples were truly in love was developed. However, the test has caused mostly negative results, which lead to an increase in couples breaking up and divorcing. School teacher Anna gets a job at the Love Institute, a one-year-old company founded by a man named Duncan, where researchers and instructors have couples undergo relationship-strengthening exercises to help them pass the test, as an instructor. Duncan believes that continued research will be beneficial, hoping for more positive test results. Anna initially keeps her hiring a secret from her boyfriend Ryan, with whom she has previously passed the test.