Copywriting: An hour ago, I found a letter at home. It was a love letter to my dead best friend, and the letter was written by my husband. An hour later, I received a call. My husband was in a car accident and died on the spot, just because he wanted to come back to surprise me on Valentine's Day. ... Go back to the past, find the truth, and change the outcome, but what if you can't change it no matter how many times you go back? I know many people's secrets, but I have forgotten my own...