2nd Strongest High School Student

Read manhwa 2nd Strongest High School Student / 2회차 최강 고교생
Ijima Kosei, who was the same as the poor son.
He lost his sister and suffered from trauma due to Shinjuku Daejeon.
One day, he refused to manipulate the game of mixed martial arts, and he was killed and opened his eyes and returned to a high school.
What if you can change everything that has happened in the past?