S1, E2: Ji Sung attempts to find the man responsible for a friend’s murder. He then meets Do Kyung who he thinks is a criminal but later finds out she is the New Head of Operations. He finds the man who he thinks is responsible for his friend’s death but after a failed attempt at capturing the felon in the airport, Ji Sung is forbidden from following him any longer. As punishment for disobeying previous orders, Ji Sung is delegated to work at the airport to monitor for suspicious activity as well as for suspects