Ajeossi, that's how the mysterious man next door is called by a neighbouring little girl who always comes to him when there's trouble at home. One day, she comes home and there are some strangers torturing her mum. They are on the search for something, but can't find it, so they sift through the whole apartment complex, but then they stumble upon Ajeossi. The gang members kidnap the mother and her daughter, and promise to release them if Ajeossi does a job for them. Wanting to save the girl and her mother, he agrees and so the battle of life and death begins.