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Do Bong-soon (Park Bo-young) was born with superhuman strength. Her strength is hereditary and passed along only to the women in her family. Her dream is to create a video game with herself as the main character. She desperately wants to become a willowy and elegant woman, which is the ideal type of her crush, In Guk-doo (Ji Soo), a police officer. Thanks to her strength, she gets the job of a bodyguard, to a rich heir Ahn Min-hyuk (Park Hyung-sik), the CEO of a gaming company, Ainsoft. Contrary to Guk-doo, Min-hyuk is an odd man who is playful, a little spoiled, and has no regard for rules, and dislikes policemen. He has recently received anonymous threats, blackmails, and has even been stalked at an occasion.
One day, a series of kidnapping cases break in Dobong-dong, the district Bong-soon lives in, and she is determined to catch the culprit after her friend was targeted. Under the help and training from Min-hyuk, she manages to control her strength to use it for good causes. Min-hyuk and Bong-soon find themselves and their relationship growing into something more.