empty.As he reached the door to the teaching office, he paused for a moment, seeming to contemplate something before knocking."Come in!" Long Hengxu's voice rang out.The dance master strode into the...ifferent anglesThere was no one at the door, and the deep blue glass door remained closed. 。The dancer extended his hand and pressed it directly onto the glass. 。A bright blue light flashed and disapp...