Back at the factory, Ren tells the story of how they fought a cruel battle a few years ago. When he returned, little bai was dying. Ren tells us that they can't continue the treatment because it looks like he's going to die soon. They have a new retrofit treatment, which means they can no longer treat him. Ren is so scared that he tells everyone not to leave him alone. He tells them that when he first came back from the war, he was a zombie. Since then, he has changed into a cruel, fierce and paranoid person. Ren says that he and Ren have gone through a lot of trials, and Ren is jealous of how much they've both suffered. Ren admits that he wasn't very true to Ren at first, but Ren is very thankful to him for helping him become a better man. Ren explains that Ren is like a key in his life, making him think that it's easy to fall for someone. Ren wants to know when Ren started being inseparable from him. He says that that's the most important thing in the world, and that he'll do everything in his power to make sure that little bald head grows up healthy and happy.