男主季白（王凯饰）和女主许诩（王子文饰）是看似关系冷淡的师徒，却是生死相依的战友，更是相互钦慕的爱人季白是深沉冷酷的资深神探，许诩是一位犯罪心理研究的天才新两人在联手破获一桩大案之后，季白对这个单纯睿智的爱徒新生爱慕，奈何无论他如何明追暗夺，这个如“蜗牛”般迟钝的女孩，就是收不到爱的信号。就在二人“谈情说案”之际，沉寂已久的“天使杀手”悚然重现，将他们卷入极致甜蜜、却也极致艰险的追凶之旅。

"If snails have love" is a An urban emotional drama, mainly tells the story of the indifferent captain of the criminal police and the criminal psychology expert gradually develop a good impression in the process of cooperation, and cooperate to solve the case together

Ji Bai and Xu Xu look like a pair of master and apprentice who have a relatively indifferent relationship, but in fact they turn their backs on each other The comrades-in-arms of the other party are also like a pair of close lovers. Ji Bai has a deep personality but has a fiery heart, and Xu Xu is a genius who is good at studying criminal psychology. The combination of the two quickly solves major cases. , Ji Bai developed admiration for this apprentice with a simple personality but outstanding abilities, and soon he launched an offensive. Unfortunately, Xu Xu, who is talented in solving cases, is relatively slow in this area. The above is also a romantic story of love and romance. The plot revolves around the relationship between the two. Ji Bai is not as cold and blunt as his appearance, and the process of pursuing Xu Xu also reveals a lot of charm.