Mi-kyung drives a van for a private tutor institute. Yi-man works part time at a local supermarket. Bong-sun lives with her sick children, and Eun-ji is being chased down because of her father's debt. Nothing can get any worse for these women and they only dream to live a simple life in the future, but one day, they get themselves into a big mess when Hyae-ran runs off with their money. Mi-kyung gathers up others to catch her and get their money back, and this is how the 'Bongchon 3-dong Girl Scout' was organized. As they fall deep into a cruel underground world, the situation turns for the worse.