Adapted from Zhang Haochen's popular novel "I'm only one person in the world", the play tells the romantic love story of a fat girl, Zhen Yuanyuan, who turned into a supermodel star Eva after losing weight successfully and reunited with the male god Ruan Dongsheng.

What Eva doesn't know is that Ruan Dongsheng has always liked her (chubby Zhen Yuanyuan). Finally, they went through hardships. In this process, they gradually developed feelings because of those experiences and started a sweet and youthful love.

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In order to save Ruan's mother, Eva was desperate and put herself on the fat again. She knew that there were still many misunderstandings between Ruan Dongsheng and her mother, and she didn't want Ruan Dongsheng to have regrets. Ruan's mother woke up and told everything to Ruan Dongsheng. Ruan's father did find Ruan's mother, but at that time Ruan's mother was also in deep debt crisis. Ruan's father didn't say he owed money when he saw someone urging him to pay it back.

Ruan Dongsheng chose to trust his mother and forgave her. Ruan's mother recovered, and everyone began to prepare for Eva and Ruan Dongsheng's wedding. Eva and Roy accidentally drank juice with excessive calories when they went to the beauty salon, but strangely, she didn't gain weight. She tried many high-calorie things, but none of them got fat. She had a strange disease of "balloon man", which was inexplicably cured.

A week later, in the presence of all relatives and friends, Eva and Ruan Dongsheng held a grand wedding. Regardless of beauty and ugliness, Ruan Dongsheng has always been the only one in his heart, and it will be the same in the future.