Turn this World Around, Upside Down

Trying to survive in apocalyptic world our main character gets betrayed and ultimately meets his demise. However, he somehow finds himself back in time when world was yet to be consumed by horror of otherwordly creatures. Follow our 34 year old Dr. Ethan, now stuck in body of his 17 years old self, on his journey to complete the project that had once took his life. Capture his dark yet exhilarating adventure where he'll be fighting battle not just against time but also brand new enemies he never encountered in last life. Also follow the blooming romance between him and his senior classmate Agni who once perished under force of apocalypse in past. Will Ethan be able to save his world given new opportunity? Will he opt for revenge against betrayal? Or will he find forgiveness in middle of burning world? Tune in to headstart this adventure~