Zheng was merely a regular white collar previously, at most someone with the potential to survive. This potential only surfaced after he revived the person he loved the dearest. That was also when he lusted to live on. After he was not alone anymore, he bore too much, friends, comrades, the blood of his enemies, the expectation of his love, and the hatred of his clone. It was all these responsibilities that made him the person he was.
“Raising newbies as slaves was no doubt a powerful method to quickly become strong in the beginning stage. If God determines difficulty based on the strongest individual and the average of a team, such team won’t encounter movies that are too difficult. So a team can obtain large amount of points and rewards while staying within safety. That’s the biggest advantage to this method but it will eventually lead to the team’s destruction.”