At the beginning of the Tang Dynasty, a rain prayer ceremony was organized to alleviate drought, but it was used by those with intentions to create a mysterious case of "Thousand-Headed Demon" appearing. The intelligent and extraordinary death row inmate Dugu was appointed by the Holy Emperor to investigate this case, but unexpectedly, it involved even greater conspiracies.

讲述了四个城市，四对爱人，同样处在30+人生阶段的他们，人生的轨迹开始出现偏差。四个不同身份，普通人们有了自己的故事，收获不一样的成长痛。30多岁，他们在客观困境中找到幸福的方向，走向不惑；就像在这个看似难熬的冬天，大家都在期待春暖花开，而春天如约而至。 三十不惑、爱情不惑、命运不惑。

唐朝玄宗末年，独孤被一个刀法高超的武林高手收养，长大后的独孤成了一个嫉恶如仇的人。他为了替花蕾报仇，他和花蕾一起经历了层层险阻除掉了刺客组织首领厉换天，替花蕾报了仇。磨难和生死的洗礼让他找到了自我。