No Mercy

A former hand-to-hand combat instructor in the Korean Army, In-ae, seeks to take revenge when her younger sister Eun-hye disappears and she finds out that Eun-hye suffered violence and sexual abuse from school bullies, politicians, and gangsters. In-ae's ruthless pursuit of Eun-hye's abductors and traffickers leads her on a dangerous and thrilling adventure, where she will stop at nothing to punish those who took her sister.

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Some movies that have similar genres and were produced around the same time as No Mercy include The Killer, Shazam! Fury of the Gods, My Name Is Vendetta, Raging Fire, Now You See Me 2, The Courier.