Our story begins with Junior Detective LIN, who has just been put in charge of a case that appears to be a suicide. Most curiously, the crime scene has many features in common with a scene from a Sherlock Holmes novel. Detective Lin quickly discovers that it is a murder case. Meanwhile, a group of young sleuths supports their detective club president GAO’s dream to win a writing contest. The three club members, psychologist ZHONG, social worker WEN, and pharmacist ZHANG, each harbor a hidden secret. GAO could never have expected that he would become implicated as the killer in an actual murder case! As Detective LIN delves deeper into his case, a series of seemingly unrelated events all end up pointing towards the club members.

Does 'X' represent the infinite possibilities of love, or... the version of him/her you’ve never discovered?

What can five years change in your life? When Nan Gong Yu returns home after being away for five years, he meets Wu Jie En by accident, and the two fall in love. Gong Yu’s family is still devastated by an arson fire in 2012 that claimed the life of Gong Yu’s brother, Nan Gong Tian. When Gong Yu discovers a time machine that can take him back to 2012, what willhe learn about the accident that changed his family’s life forever? Will it affect his current relationship with Jie En?

Drug dealer Guo-hao hopes to make big money by an unknown cocaine deal so that he and his girlfriend can leave their life of crime behind. But he soon realized that the whole thing is not that simple.