YUAN dates MAN for a concert performs by orchestra; again, MAN pretends having a stomachache and declines the invitation. Furthermore, he asks TIN to be his substitution and disappoints YUAN obviously. The next day, YUAN asks MAN to attend the astrophysics camp together; once again, MAN gives the ticket to TIN in a hurry and asks him to take care of YUAN thereafter. WAI finds TIN suspicious; hence, she follows him to the astrophysics camp. Due to the misunderstanding of slang, TIN thinks that it is a nude party. Therefore, he is so excited to take off his clothes under a tree when he reaches the campsite. WAI is so scared about his wield act and shouts at him immediately. Meanwhile, YUAN arrives and explains that it is an astrophysics camp only.