Female college student Li Shengsheng (the heroine) and her friends discovered something suspicious because of their part-time job as a customer service phone company. They discovered that it was a drug trafficking and money laundering operation. They called the police rationally and cooperated with the police tactfully. Xiao Ran (the male protagonist) and a series of things that happened after that, Xiao Ran developed a different feeling for Li Shengsheng as they got along slowly.
Intention: Be serious and cautious in doing things, and keep a close eye on anything given to you by others.