Eo Yong Mi, Ahn In Kyung and Maeng Soo Ja work as cleaning ladies at a brokerage company. Eo Yong Mi raises her two daughters by herself and she struggles to make a living. An In Kyung dreams of buying a food truck to run a mobile cafe business. Maeng Soo Ja seems like a very sociable person, but she is only friendly to people when she needs them. These three cleaning ladies happen to overhear insider information at their workplace. They invest their money in a stock, using the insider trading information.