Transmigrated into my parallel soul

Zeth Tristian is a man who works for the world goverment in the dark and he is one of the most influential person on earth He is in the group who rules the world in the dark but through passage of time he had become older he is on his death bed and even though he is on his death bed he has no regret because he has done everything he has to from the day he was born and was truly satisfied but what he didn't enjoy was his school life and that was the only sad thing in s in his life and finally after 2 days he passed away peacefully. So he thought but he was transmigrated to his highschool in a parallel world where he was the polar opposite of what he was in earth Watch Zeth as he change his past character to be the new Zeth