The female protagonist is \”Mitarai Yang\”, whose occupation is a female elite in a shoe company, and the male protagonist is \”Ishida Ren\”, an employee of an urban development real estate company. The two are university classmates. They have a bet: \” Before the woman’s 29th birthday, whoever gets married first and the other will give a big red envelope of 300,000 yuan\”… The two assert that there is absolutely no possibility of development between each other. In order to win the bet, the male protagonist actively pursues the company’s female juniors. The heroine also reunites with her ex-boyfriend, and the story begins.