Chapter 1 - The beginning of a great story

So this is my boring story. My name is Dev. I am a 35-year-old man and an MMA fighter. I am a well-trained fighter. I am trained in every single martial art on this earth and weapons. When I was little, I was kidnapped by an organization called the Black Dragon Society. They train kids and make killing machines. They train me and some other kids for 12 years. And after 12 years they take our test. They put us on a big ground covered with big and long walls. Out of 27 of us, 3 of us survive, including me and 2 other boys. They give us missions. I complete 5 missions; most of them are killing people. After 6 months, special cops arrest them and rescue us. I was sent back to my family. My father is a boxing champion and teacher. My mother is no more; my father tries to find me, but nothing works. So he focuses on his dream along with finding any clue about me. After I get home, I complete my basic education. After that I became an MMA fighter at the age of 25. My father died due to lung cancer at the age of 67 when I was 30. My relatives said that he started smoking after I went missing. At the age of 32 I become world champion. After that I didn't have any goal in my life. So I quit MMA. I become unemployed. My daily routine is waking up at 10am and reading webtoons and web novels. One day after so much time, I make up my mind to go for a long drive. I am driving my car at 140 km/h and enjoying the nature. Suddenly I see a train coming. And the rail gate was open. My brakes failed, and I crashed into the train. I think that day the truck-kun was on vacation.