Adventures in a Parallel World

I'm a transmigrator with no System and no special abilities. I'm the unluckiest person alive. After twenty long years of hard work, the senior student I pursued even set me up. With my heart broken, I had no choice but to go back and grow pears to make a living. Then one day, a girl from the future told me that the world was about to end, and I had to search parallel worlds for a way to save it. This is so freaking cool! Senior, you may be a wicked-hearted snake. But what if, and I'm just saying what if, I return with advanced technology from a parallel world? How will you handle that?