亨利·戈尔丁饰演一名因背负了复杂过去而隐忍的独行者，代号蛇眼。一次偶然，他救下了岚影一族的准接班人，从而被邀请加入他们在日本的组织。在那里，岚影一族不但教会了蛇眼如何成为一名忍者，也给了他一直想要的一个家。但当蛇眼过去的秘密被逐渐揭开，他的信誉以及对组织的忠诚也将受到考验，即便这会使他会失去最亲近的人的信任。特种部队原著中的经典角色也将在《特种部队：蛇眼起源》中一一亮相。

影片为2019年《唐顿庄园》电影的续集，在这一部故事中，唐顿庄园将迎来一个崭新的时代，与此同时，老伯爵夫人（玛吉·史密斯 Maggie Smith 饰）的一段神秘过往也将被揭晓。

Born in Dongduchon, Chil-su is talented in art. While waiting for a wedding invitation from his sister in America, Chil-su quits his job painting theater signs which is his livelihood. He becomes Man-su's assistant. Man-su is in the army serving his military duty. He suffers under the dark shadow of his father. Chil-su gets dumped by Ji-na, a college student, and he loses all contacts with his sister. Understandably, Chil-su feels a little shaken. On the other hand, Man-su is unable to find stability. One night after they finished a large billboard, the two rave around the tower goofing around. However, the police are deployed when they misunderstand and think that they are trying to kill themselves. Through their misunderstanding, Man-su ultimately falls and injures himself while Chul-su is led away by the police.

就读于绍海三中的高二男生张伟（辛云来 饰）其貌不扬，成绩平平。在老师和家长眼中，他似乎是一个朽木不可雕也的无用存在。而在这样的忽略和冷落过程中，他的信心也逐渐丧失。可是偶然的机会，他居然被任命为学校组建的男子花样游泳队队长，在这里他遇到了运动神经发达的男神高飞（李孝谦 饰）、超级学霸陈铭涵（冯祥琨 饰）、风趣幽默的蛐蛐曲小东（王川 饰）和呆萌诚挚的大男孩王子（吴俊霆 饰）等一群性格各异的队友，并且随即展开艰苦训练。男孩练习花游？似乎滑稽，又很搞笑，甚至会遭到很多人的嘲笑与白眼。但是人们只在乎你行不行，为何不再努力一下呢？本片翻拍自日本同名电影。