Vita is a rookie genius in psychological research. Her brain works as if there were a rapid generator in it. In fact, it is a gifted talent as a snail. Upon joining the police force, she is facing the fate of getting removed due to her weak physique. Since Officer Prach is the only one that can help her, Vita tries everything to make Prach take her in as his mentee. As the captain of the Police Investigators Team (PTI), Prach is one of the few brilliant, experienced, and skilled investigators. At first, Prach does not take a liking to Vita. Besides, both are not on the same page regarding how to deal with cases. However, having joined hands and solved a series of cases, Prach begins to fancy this innocent yet witty mentee of his. Alas, Vita, who is as dull as a snail, does not feel Prach's love. When the two of them are talking about love and cases, the spooky serial killer is back. Prach and Vita finally acknowledge their feelings toward one another in the face of danger. Prach has always been bothered by the Luger case, which has reopened. The lovers once again join hands to embark on an extremely menacing journey of catching the criminal. ~~ Adapted from the novel “When a Snail Loves” (如果蜗牛有爱情) by Ding Mo (丁墨).