Framed as the notorious Night Devil on his wedding day, top detective Xiao Beiming is accused of murder and treason, forcing him to flee. Three years later, he returns to the capital, earning the trust of his apprentice sister, Zhong Xueman. With a team of fearless allies, he unravels a series of mysterious cases, to expose the real Night Devil and restore order to Da Qi.

要相信：熬过异地，就是一生。故事围绕赵一一（任敏 饰）和许嘉树（辛云来 饰）展开，高考之后，赵一一终于向暗恋多年的许嘉树表白，却阴差阳错开启一场异地恋。他们坚信：熬过异地，就是一生。可远距离恋爱的天然阻碍考验着他们，明明相爱，却不断缺席对方的生活。赛赫（陈宥维 饰）的出现以及闺蜜乔乔（周雨彤 饰）和李唐（李孝谦 饰）一波三折的爱情都让赵一一感触良多。当异地恋升级为异国恋，是继续坚持，还是一别两宽，各自成长的二人不得不面对自己内心的答案……