A Korean salesman seeks a successful career by using a bar hostess to spy on his rivals. However, soon he confronts the bar hostess's revenge, as well as his rivals' popular products.

Kim Pan-chok (means "sales promotion") is assigned to work in the sales promotion department of Yumi Inc., a sweetener manufacturer. He falls ill after a heated sales war with Gammi Inc., a leading competitor and is hospitalized. He devises a genius plan while in the hospital.