Go Hye-rim (Han Ye-seul) is a fortune teller and café owner who goes by the name of Madame Antoine. She claims her fortune-telling abilities are based on a spiritual connection with the famous French queen Marie Antoinette. By her own admission, she has no such royal connection , but she is skilled at reader and has a knack for following up on hunches and picking up on detail.
Choi Soo-hyun (Sung Joon) is a psychotherapist specializing in women's psychology and is known as the 'Soul Doctor' to Hollywood stars. Although his Stanford professorship and good looks make him a highly eligible bachelor, his past research and life experience have left him skeptical that true love actually does exist. Choi Soo-hyun moves into the space above Go Hye-rim's café and sets up practice, where he designs an experiment intending to prove his hypothesis about the nature of true love. His decision to name his practice Madame Antoine leads to a disagreement with Go Hye-rim, whom he then tricks into taking part in his experiment.
