Regret: Going Back to the Past

Do you have a childhood sweetheart? Have you forgotten him, or is she still by your side? If I could go back in time, what should I do, what should I say... Fortunately, I did go back. Yes, I thought I went back, but in the end... Looking at the smiling face in front of me, it doesn't matter anymore, as long as it's you. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.