My Dear Wife, Post It! I'm Here to Save You!

A temporary imaginary article, a super mini short story, has been completed. Less than a year after we got married, my wife died in a car accident. I wanted to live a decadent life, but unexpectedly one day my deceased wife's sister rang my doorbell on a rainy day... My aunt gave me a time-travel machine and asked me to go back and save my wife, but the price was... In the process of rescuing my dead wife, it seemed like there were countless forces in the dark that were stopping me... What on earth were they? !