This was a promise made using his 'military uniform' as a means. He promised her that he will definitely be back to retrieve his uniform and epaulette.
He also promised Ye Jian that his identity would never change. A country can't exist without defense while civilians won't feel safe without soldiers. He was the defense and a soldier. How could he easily give up his identity?
Releasing his hand, Xia Jinyuan smiled, "You helped me wash my uniform, I'll help you wash yours too. But I can't be sure that the bloodstains would be removed."
"It's unlikely. I plan to try to exchange them for a new set when I'm back at school, or buy a new set." He was not someone who would make promises so easily. Once he said it, he would do it. She believed that he would definitely be able to do it. The corner of Ye Jian's mouth curved slightly, "Bloodstains are the most difficult to remove, but if you can remove them, it would be the best."