Pianist Leon suffered a meticulously orchestrated tragedy: his wife faked her death, and his daughter fell gravely ill. To secure funds for her medical treatment, he sought help from mafia boss Albert and was forced to become Albert's captive pet. Leon attempted to escape multiple times, but an accidental fall led to amnesia. Feigning compliance, he bided his time to escape. After recovering, he successfully fled, only to stumble upon a cruel truth: his daughter was not his biological child, and his supposedly deceased wife had colluded with his best friend to orchestrate the entire deception. His beliefs completely shattered. After exacting revenge on his tormentors, Leon confronted his inner self and ultimately returned to the possessive and domineering Albert, willingly becoming a caged butterfly.