"The mission went well, with no injuries." Lu Xingzhi looked down and gently touched his stomach after replying. There was an injury. He was slashed on the stomach by a knife. It was not serious however, so he decided not to tell her.
By the time they see each other during the National Day holidays, the injury would have been nothing but a scar.
He realized that he would not be able to hide his injury once Jiang Yao had arrived. Unless he held off any intimate activities, which was unbearable to even think about.
Scabs would have formed by then, and knowing Jiang Yao, she would probably berate him a little. Since it was nothing but scars, she would not have to worry.