Geom is the son of a virtuous nobleman, Lee Won Ho, who is a trustworthy supporter and brother to the king and a central member of the secret organization, Cheonwoohoe, comprised of important nobles and with the king as their leader. He lives peacefully in a house with many plum trees with his wife, daughter, and son. However, a mysterious rumor is spread that he is plotting to overthrow the king. Knowing about this, the king kills Lee Won Ho as he believes that 'two suns cannot exist on the same sky'. Geom witnesses the incident from the inside of a safe where his father hid him. Later, he is saved and adopted by a retired thief, Seo Dol, after he becomes stricken with amnesia due to the shock of losing his father and being forced to throw a rock at his mother's head to prove that he was not the son. 13 years later, Geom, who was renamed Ryung by Seo Dol, starts to regain his memories and begins to search for his older sister, Yeon, only to see her being sentenced and hanged. The murder of his older sister leaves Geom seeking revenge. With the emblem on the killer's sword he remembers from 13 years ago his only clue, he swears that he will find the one who killed his father and murdered his older sister. To find the sword and its owner, he disguises himself as Iljimae and breaks into the nobles' estates. During the course of his actions, he winds up fighting not only for himself, but also for the people. And so he becomes a fighter for the common people, jumping into action whenever the people are oppressed and wrongly exploited for the sake of the nobles, although at the core of his motives his desire to bring the person who ruined his life and his family to justice burns bright. 一枝梅花……。怎奈好奇心打败偏见---更眷恋于隐忍的爱情。关于李俊基，关于凤顺。。一枝梅有感。小子，哪有人身上没有污垢啊？。【吕珍九】李谦。韦小宝为何不是一枝梅？。爱上勇，爱上李俊基。关于部分角色。喜欢上了时厚。 一枝梅原本是中国话本小说《欢喜冤家》中第24回故事中登场的一个人物，而随着该《欢喜冤家》在朝鲜时代后期传到朝鲜，故事中的人物形象也开始出现在朝鲜的文学作品当中。 李谦（李俊基 饰）9岁时目睹父亲被杀，母亲和姐姐沦为阶下囚，因为受不了打击失忆，后来成为了铁石家的养子，被取名勇儿。渐渐长成为一个小混混。偶然机会恢复了记忆对父亲的死开始怀疑起来，而唯一的线索就是刺死父亲的剑上的图案，为了寻找到那把剑，勇儿成为了小偷，成为了江湖上盛名远扬的侠盗一枝梅。他专门惩罚有钱有势，有武力的贪官，与当权者和腐朽的社会制度进行抗争。由此他也成为朝廷官员们最痛恨的罪犯，以及穷困百姓们的希望，然而无论百姓和朝廷官员都不知道他的真正来历。偶然的机会下，一枝梅与贵族卞植（李元钟 饰）的女儿卞恩彩（韩孝珠 饰）相遇，并陷入爱情。 最终一枝梅是否能找出当年父亲遇害的真相？
