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If one day, there is an opportunity that can enhance your ability in a certain aspect to an astonishing level, what will you choose? Xia Linfei, the daughter of the famous detective Xia Haichen, has had astonishing strength since birth; while her best friend Luo Luo has had superior memory. The two have been regarded as "alternative partners" by their classmates since they were young, and have become Xia Haichen's right-hand assistants in the Detective Agency. During the summer vacation, in order to complete her summer homework - shooting a movie, and to complete the task entrusted by her father, Xia Linfei and her partner Luo Luo, his younger brother Xia Yi and his school girl Youyou came to the luxury cruise ship "Nordic Goddess" to shoot the movie. As soon as they boarded the ship, they met the mysterious and charming young genius Mo Haiyin. Soon, Mo Haiyin also joined the filming team.

After a year, Xia Linfei is back full of energy and will bring us more thrills and touches! In spring, Xia Linfei was entrusted by a mother to find her son Fang Ziyan who had run away from home. With the help of Luo Luo, Xia Linfei found out that this was related to a popular video on the Internet "A 4-year-old girl was hit by a car and 19 passers-by passed by indifferently" - Fang Ziyan was one of the 19 passers-by. This made him, who was originally a middle school student, ostracized by the teachers and students of the school and reprimanded as "incorrigible". Unbearable, he had to choose to run away from home... Xia Linfei and Mo Haiyin used a little trick to slowly get closer to Fang Ziyan, opening up his lonely heart...