After taking shots at a work function, Do Kyung gets sick and Ji Sung helps her. In the process, the two talk and learn about each other. Later, Ji Sung demands that the airport raise the security level for an industrial spy at his first meeting with the airport authority and the board. Despite Do Kyung's resistance, the security level gets raised, causing delays for passengers. Being blamed for the commotion, Ji Sung finds a Triad pendant on the neck of a man who may be the spy.

志成被派到国情院驻机场部门工作，道京向本部长提出志成不久前还破坏过机场秩序，不应接纳他。　　河俊组织同事聚餐为感到孤单的道京接风，道京不肯示弱以致醉酒。志成为难受的道京轻拍后背，之后两个人自然地聊了起来，彼此进一步了解。这时，河俊出来找道京，酸溜溜地向志成介绍说他是道京的小学同学。　　志成第一次参加机场工作会议就直接提出让机场提高保安等级，捉拿窃取新技术嫌犯。这样做会给机场造成混乱，道京率先表示反对。不过毕竟国家安全高于一切，机场方面最后还是提高了保安等级，乘客和工作人员怨声载道。　　还好终于有了嫌犯的一丝踪迹，志成需要赶往釜山港。道京直言不讳地对志成只考虑自己的工作表示寒心，志成拿着英宰留下的吊坠，情绪激动地对道京说他一定要找到凶手，道京被志成的态度打动。　　志成分析嫌犯有可能到仁川。道京在健身时发现查理戴着与英宰留下来的一模一样的吊坠，慌慌张张离开，拔通了志成的电话……