本剧讲述了顾言洛、叶未眠等一群年轻大学生在成长道路上邂逅爱情与友谊，并在彼此的陪伴鼓励下实现青春梦想的故事。冷面校草顾言洛（罗正饰）和鬼马少女叶未眠（季美含饰）因一场尴尬的偶遇相识，两人阴差阳错陷入爱情；飒爽御姐路遥（李莎旻子饰）和“骄萌海王”慕泽（陈鹤一饰）则是一对欢喜冤家，互怼不断感情却逐渐升温；与此同时，天才画手左司辰（文渊饰）、呆萌学霸言九月（常华森饰）也同样在成长中找到了属于自己的梦想和爱情。
刑警徐靖之（段奕宏 饰）因故人案中的疑点陷入心结，自请离队深造，十年后自认放下心结的他重归一线，回到前妻何雅（王佳佳 饰）带领的刑一队。然而新案环环相扣，古怪难查，徐靖之发觉诸案的幕后黑手庄明诚（窦骁 饰）竟是“已死”的故人之子，“弟弟”陆染。徐靖之将计就计，一边凭借领导战友的信任打入犯罪集团内部，一边接近庄明诚，阻止他泥足深陷。殊途兄弟借案交锋，两人终将作出各自的抉择。
At the end of their stint in Viet Nam, Col. John "Hannibal" Smith and his team were framed for robbing the Bank of Hanoi (which they had done, but under orders), and sent to a US military prison. They escaped and went on the run, pursued first by Col. Lynch and later by Col. Decker. While on the lam, they became heroes for hire, working as good-guy vigilantes around the US or t...
外星人适应了。人类也将如此。
《入侵》的第二季动作十足，几个月后，外星人升级了对人类的全面攻击。
