义侠[大刀王五]锄强扶弱一刀平天下。知己难求，能舍身为友的人更是廖若晨星。因此之故，清人王五（吴卓羲）与课嗣同（黄宗泽）的友谊一直为后人所乐道。五一向视读圣贤书为苦事，给母亲王阮心怡（邵美琪）送入武学堂后才学会脚踏实地。五在的学堂认识了为逃婚而进学堂的同。同才情洋溢，与五一文一武，惺惺相惜。他俩在教官陈道扬（刘松仁）熏陶下，不但武艺精进，更培养了行侠仗义的武德，三人建立起亦师亦友的关系，为避开妻子李闰（杨怡）而入学堂的同在学堂里遇上了卓兰格格（杨思琦），可惜兰只喜欢五。离开学堂后，五在扬在协助下重开亡父的顺源镖局，同则推行改革以望救国救国。同得罪了权贵荣禄，遭其打压。同失意于官场，蓦然回首，才发觉闰一直不舍不弃，夫妻二人自此同为理想而奋斗。同和五各有各要走的路，然而二人在年少时建立起来的友谊始终未变。多年以后，百日维新政变，同被擒，五舍命相救

It’s hard to find a true friend, but it is even harder to find a friend who will sacrifice himself. Therefore, the friendship of Wang Wu (Ng Cheuk Hai, Ron) and Tan Si Tong (Wong Chung Chak, Bosco) during the Qing dynasty is still a story with relish. Wu has thought that studying is a very hard work for him. He learns to become down to earth only when his mother, Mrs Wang Yuen Xin Yi (Shiu Mei Ki) sends him to the school of kung fu. At the school, Wu meets Tong, who has come here for escaping from marriage. Tong is very versatile, and Wu is very active. They both admire each other’s talents. Under the coaching of Chen Dao Yang (Lau Chung Yan), their kung fu techniques have improved a lot and they have cultured with a righteous heart. On top of the teacher-student relationship, the three have soon built up a friendship. Tong, who tries to get rid of his wife Li Run (Yeung Yi), meets Princess Chao Lan (Yeung Sze Ki, Shirley) at the school. However, Lan only loves Wu...