You are a partner at a prestigious law firm. One day, you receive an invitation to a funeral, for your high school friend Xu Dongming, who was the heir to a top tycoon. Tragically, he was murdered in his own villa on his thirtieth birthday. The killer is also someone you know well - Daniel, a renowned pianist and another high school friend of yours. In high school, they were inseparable, but years later, one has become a murderer, and the other has passed away.
At your friend's funeral, you discover he has left you a personal keepsake. As soon as you open it, you are transported back to your high school days, to the origins of all the tragedies, at Princeton International Academy...