Eun-jin was separated from her older sister Yu-jin when they were kids at an orphanage. While growing up, Eun-jin became a Kkangpae (Korean Mafia) gangster and adopted the nickname "Mantis." Upon discovering that Yu-jin had cancer, Eun-jin demanded that the doctors perform an operation; however, they refused. The dying Yu-jin wished that her sister would marry soon, so Eun-jin went on a blind date under the advice of her underling Romeo, who invited a stylist to design the appropriate makeup for Eun-jin. However, the date was a disaster and Romeo was sent to find someone else more suitable.