Air City

Ji Sung, an NIS agent, and Do Kyung, the new operation manager, get arrested for a drug case at the airport.

An emergency occurs at Incheon Airport due to Wang Wei, and Ji Sung embarks on a fierce chase to catch him.

The industrial spy causes the security level to be raised, and Ji Sung finds a lead for the spy case.

While chasing down Charlie, Do Kyung is held hostage and Ji Sung rushes to save her.

Myung Woo asks Ji Sung for help, but is refused. Do Kyung sees Yi Kyung, but turns away and leaves.

During the runway closure, Do Kyung notices her feelings toward Ji Sung, but feels hesitant due to his ex.

Do Kyung gets arrested for a drug charge, and both Ji Sung and Ha Jun strive to help her get released.

After a temporary release, Do Kyung goes to Hong Kong to find Ha Jun who had left to help her get released.

After proving her innocence, Do Kyung heads to the island Ji Sung is staying at with the headquarters staff.

Following an error with the luggage system, Ji Sung and Do Kyung each face an issue to resolve.

The fake supernote case causes Ji Sung and Ha Jun to clash, and Do Kyung receives Myung Woo's blessing.

Confusion is caused by the supernote forgers and their bomb threats, while Ji Sung tries to catch them.

An incident occurs as Do Kyung takes on an important project and Ji Sung sets the situation straight for her.

The project proves to be a challenge for Do Kyung, and Ji Sung finds out about Myung Woo leaving the airport.

Ji Sung's career makes Do Kyung have doubts about their future, and the headquarters' efforts are thrown into chaos.

When Ji Sung finds out about Myung Woo's secret, Do Kyung realizes it might be time for them to break up.