My Boyfriend is Type B is a South Korean romantic comedy film from the year 2005. The basic premise of the film comes from the Japanese blood type theory of personality, which claims that a person's blood type can determine their personality traits. The heroine is type A (conservative and introverted) while her love interest is type B (passionate and irresponsible).
Acting
Han Ji-hye's exasperated expressions carry the entire film.
Writing
Commits fully to blood type pseudoscience with zero irony.
Director
Choi Seok-won
Trivia, insights & behind the scenes
Blood type personality theory remains weirdly popular in Korea and Japan—it's even used in job interviews and matchmaking apps.
The film sparked actual dating debates in Korea, with Type B men complaining of real-world romantic discrimination post-release.
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