Coin Locker Girl (2015)

A child abandoned in a subway coin locker is sold to a ruthless and calculating loan shark and gangster boss dubbed “Mother” (Kim Hye-soo), who runs an organ-harvesting ring in Incheon’s Chinatown. Named Il-Young (Kim Go-Eun), the baby girl grows into Mother’s loyal right-hand enforcer and is groomed to be her eventual successor. But when Il-Young’s loyalty to Mother wavers, the clash between the two unleashes a merciless tidal wave of blood-soaked retribution and strife.

Source: TMDb