Pure Pumpkin Flower revolves around Soon-Jung(Lee Chung-Ah) as she goes through difficulties, but does not lose hope and finally accomplishes her dreams.

Soon-Jung has a bright character, but when she decides to do something she will persist until it is accomplished. Soon-Jung is raised by her single father Hyun-Mook (Jang Hyeong-Seong). Hyun-Mook has known that Soon-Jung is not his biologicial daughter and was deceived by his ex-wife Joon-Sun (Bae Chong-Ok). Nevertheless, Hyun-Mook raised Soon-Jung with all of his love.

Since Soon-Jung was 12 years old, she has decided not to do two things. The first one is to never eat tasteless rice. The other one is to never make her father eat tasteless food. Soon-Jung never had interest in studying and instead of going to college Soon-Jung chose to run a small restaurant. At the restaurant Soon-Jung meets Min-Soo (Jin Tae-Hyun), who delivers vegetables to her restaurant. Min-Soo and Soon-Jung eventually develop feelings for each other.

It turns out, Min-Soo is not just a delivery boy for vegetables, but he is the successor to a successful chain of franchise restaurants. Before he takes over his father's business Min-Soo wants to learn about the world and restaurant business.

Min-Soo also has a stepmother Joon-Sun. His stepmother does not believe in love or people. Joon-Sun got through 3 serious relationships, but she did not love any of the men. Joon-Sun also gave birth to Soon-Jung but she did not love her daughter either. Because of this, she turned away Soon-Jung and her father. Eventually, Joon-Soon married Yoo Jae-Hwan(Park Young-Ji), who is Min-Soo's father and the president of the chain restaurants. Joon-Sun is now a successful figure and thought of as a generous mom. This is when her daughter Soon-Jung re-appears in her life ...