故事讲述了“瓦伦丁星球面临毁灭危机，传说中能够拯救瓦伦丁星球的人将是地球上一位了不起的孩子，于是星球的使者玫瑰仙子来到地球，开始寻找这位能够拯救他们家园的小英雄”的故事。

　　Siren Phillips has lived her life thinking she's an ordinary girl, in an ordinary town. On the eve of her twelfth birthday, however, she learns that she is far from ordinary. Destined to turn into a Mermaid at the age of twelve, Siren must struggle with her new reality, saying good-bye to her mother and friends, while she transitions into the water. To make matters worse, a group of hunters are trying to catch her. She soon becomes friends with Adam Wilts, a new boy at school, who she turns to for help. He agrees to help her, but finds himself caught in the middle, when it's his own father who is after Siren. When Siren's mother is taken, the town must rally behind her, and help her make a peaceful transition into the water, before the hunters can find out where she is.

　　故事发生在光正实验学校六年级一班之中，这是校园里出了名的问题班级，所有问题学生和不良校霸都汇聚在了一班的教室之中，就连校长也拿这个班没有办法。肖子恩（韩立 饰）是学校里刚刚上任的新手教师，刚一来，就被分派到了六一班，成为了班主任。
　　刚开始，身经百战的学生们自然不可能将面前这个青涩的老师当做一回事，没多久就给他来了个下马威，可肖子恩并没有像其他老师那样大发雷霆，而是另辟蹊径，始终对学生们保持着敬畏和尊重的态度。随着时间的推移，不按常理出牌的肖老师和学生们之间逐渐建立的信任，可他的某些做法却招致了家长们的误会和抵触。

　　小小八岁那年，被爸爸卖给了算命先生吴先生当领路的，在饥荒的年代，素不相识的一老一小，从陌生和抗拒，到最后的不是亲情胜似亲情， 感人至深的故事。

　　参加夏令营活动的名额有限，班级里的同学为了争取到名额，都使出了浑身解数。学期结束，同学们都有了各自的成长。

　　故事背景发生在中世纪晚期，锁定在16世纪的欧洲改革与言论自由受到箝制。由于印刷术的兴起，相当于我们现在兴起的社交媒体，人们思想开始大规模传递，导致政治、宗教、经济和社会变革的权力斗争。一场可怕的旅程将成为一场大胆争取自由的斗争。