Loius Koo stars as Shiu-Lung,a super-cop in the 21st century when time traveling is no longer a dream. ,He volunteers to join a scientific experiment of returning to the coronation of the Qin Dynasty three thousands years ago.Emperor (Raymong Lam)was still hostagein another Kingdom.Shiu Long must help him rise to throne so that he can get back to the present.... In the course Shiu Long Meets different ancient beauties (Michelle Saram,Sonija Kwok and Jessica Hsuan)and has even developed Romances with them .will he survive all the Chaos in the answer lie in a Warrior Period in chinese history?Can he be "back to future" All the answer lie in A step into the past!!

项少龙（古天乐）为二十一世纪特种部队人员，为了挽回刻骨铭心的爱情，决定参加时空穿梭研究，不料时光机出错，龙被送回战国时代。秦始王赢攻（林峰）当时 还没有登基，被囚赵国当人质。为了能回到未来，龙决意不惜一切也要找到赢攻并助其登基。 凭着过人的机智不凡的身手，龙得多方常识，重用，不单获赐婚且练得一身绝技。唯一个现代人错落在一个不属于自己的年代，再加上树大招风，遇到困难自是不能 避免。龙在协助赢攻完成登基大业期间，不单遭人落毒，x 击和勾引，甚至还被逼参与连场政治斗争。江山易改，本性难移。生性风流的龙即使身处一个完全陌生的时空。地域中缠上了一段四角恋，周旋赵国公主赵倩（雪 儿），秦国才女琴清（郭羡妮）与千金小姐乌廷芳（宣宣）之间。 龙最终能否协助亲王完成春秋大业，返回二十一世纪？他的隔世情缘，又将如何处理？