When they reached the door of the study, Xu Yuning straightened her nurse's cap and mask again.

　　She couldn't be found out too soon or too late by Mousse, or the surprise would have to be greatly diminished.

　　The "degree" in between is not so easy to grasp.

　　After finishing organizing, Xu Yuning raised his head, "Buckle-" two times, knocking on the door of the study.

　　Mousse's low voice was fast coming through the ...