 Ha-jin starts working in Jae-myung's father's company and does everything to make the rich chairman like him, shrewdly climbing the corporate ladder until he becomes the boss's right-hand man.Dan-hee, who also works for the same company, is a softball player on the company's league team.Jae-myung becomes the team's coach, and he falls in love with Dan-hee whose headstrong and optimistic personality attracts him.