住在小女孩小米（金赛纶 饰）隔壁的当铺大叔（元斌 饰）除过生意之外和邻居们从不来往，颓废的造型以及沉默的性格让人们对于他的身份有诸多怀疑。天真的小米从不理会这些传言，时常造访这位神秘邻居竟然使他俩慢慢的成为朋友。小米的妈妈牵连到黑帮的毒品抢夺之中，最终使自己和小米陷入危险之中。目睹小米和妈妈被人绑架的当铺大叔为了救出小米和妈妈，开始和黑道展开斗争。此时，警方也在着手调查这起案件，当铺大叔元泰锡的真正身份慢慢浮出水面。被摘除所有值钱器官的小米妈妈的尸体在一辆汽车的后备箱里被发现，但是，和她一起失踪的小米却依然下落不明…… 　　《旅行者》中扮演“真希”的小罗莉金赛纶和换上颓废造型的“花样美男”元斌一起演绎的韩版《这个杀手不太冷》，成为2010年韩国最卖座的电影。An ex-special agent CHA Tae-shik's only connection to the rest of the world is a little girl, So-mi, who lives nearby. Her mother, Hyo-jeong smuggles drugs from a drug trafficking organization and entrusts Tae-shik with the product, without letting him know. The traffickers find out about her smuggling and kidnap both Hyo-jeong and So-mi. The gang promises to release them if Tae-shik makes a delivery for them, however it actually is a larger plot to eliminate a rival drug ring leader. When Hyo-jeon's disemboweled body is discovered, Tae-shik realizes that So-mi's life may also be in danger. Tae-shik becomes enraged at the prospect that So-mi may already be dead and prepares for a battle, putting his own life at risk.