Tong Tong in his previous life was kind-hearted and willing to help others. Even if the apocalypse came and he saw too many evil people, his heart did not change until the person he had saved killed the person he loved most.
Tong Tong has become cold and powerful in this life. Those who harmed him in the previous life will never let go. Tong Tong will not save those hateful people. Tong Tong only needs to live with Qi Lin.
It is stated that Tong Tong is just no longer the Holy Father and has not become a bad guy.