After Rebirth, How Did I Become a Comrade-In-Arms of the Enemy?

I finally faked my death and escaped, leaving the secret force, but I just turned a corner and was forced by a big truck to put the earth online again in a second... When he opened his eyes, he found that he was back in high school before he was abducted by Country Z and trained as a secret agent. He even had a golden finger. This time, we must enjoy the life of ordinary people. But after saving someone, it seems that he is getting further and further away from ordinary people's lives. ——Furthermore, he has become a comrade and even a companion to his once evenly matched opponent.