My Boyfriend Is Type B

Most of the romance unfolds on a university campus where Ha-mi studies. A key sequence takes place in a busy parking lot, both locations grounding the story in a contemporary urban setting where modern dating interactions occur.

The film uses the Japanese blood-type personality theory as its central gimmick. It claims that Type-A people are methodical and shy while Type-B people are passionate, lively, and carefree. The story applies these stereotypes to dating, particularly the stereotype that Type-B men are arrogant and incompatible with Type-A women.

Young-bin is the handsome Type-B boyfriend who initially comes across as obnoxious and arrogant. He ends a previous relationship rudely, showing a lack of consideration. Through his relationship with Ha-mi, he confronts his own flaws and gradually reveals a more vulnerable, caring side.

Ha-mi is a meek university student and Type-A personality who remains sincere and hopeful despite romantic setbacks. She initiates her chance encounter with Young-bin and willingly invests in the budding relationship, driving the romance forward with her genuine approach.

Chae-young is Ha-mi's cousin and a professional dating consultant who strongly believes in blood type theory. She predicts the relationship will fail and serves as a skeptical foil to the couple's efforts, creating tension that pushes the romance to prove its resilience.

The film examines how stereotypes shape dating expectations. While blood type theory suggests incompatibility between Type-A and Type-B, the narrative suggests true compatibility is built through effort and mutual understanding rather than predetermined traits. The couple tests whether love can transcend these labels.

The movie questions whether social stereotypes should govern personal choices. Chae-young represents rationalist skepticism based on blood type labels, while the couple's efforts show how labels can limit potential relationships. The humor arises from clashing expectations and the characters' willingness to challenge these stereotypes.

The romance evolves as both leads move beyond first impressions and the supposed rules of attraction. Young-bin reveals a softer side while Ha-mi asserts her own desires, teaching each other to grow. The film emphasizes that love can change people when both commit to understanding each other.