Vol 4: Chapter 2-2.

Zheng turned off the device and said to them hurriedly, “Zero, Yinkong, wait at the sniping spot on the roof. We will communicate through the device. Don’t shoot until I say so. The ghost’s next wave will attack the one who attacked it… Jie and Tengyi, you guys wait here. If the ghost follows me, please open fire…” Then he ran outside the park.

Jie shouted at him, “Zheng! Where are you going?”

“To keep my promise! And… to save our team!”

A team existed because it had the ability to unite people with common interests. Their current common interest was to survive with the help of each other. This was one of the most powerful common interests, but it was his promise to never leave anyone behind that bound them together. Even without this promise… he would still go. Otherwise...