Airport worker Han Yeo-reum transfers to a new team and is miffed to get a supervisor with only four months of experience. So why does he look familiar?
After a bomb threat is called in, Yeo-reum spots a passenger placing a duffel bag in a trash can. Lee Su-yeon reveals an oddity about his right hand.
The team aren't happy when they see who their new Terminal 2 co-workers are. Yeo-reum gets into a tussle with the belligerent daughter of a congressman.
Su-yeon recalls his post-accident struggle and history with Seo In-u. While a man with a fake passport is detained, his pregnant wife goes into labor.
Su-yeon's arm malfunctions, to his great alarm. The Terminal 2 team face a life-threatening emergency that hits close to home for one of their own.
In-u insists on Su-yeon's support device being checked for passenger safety. Su-yeon recalls a painful betrayal, and the first time he saw Yeo-reum.
In-u reveals to Yang Seo-gun the reason he holds a grudge against Su-yeon. Rumors about Yeo-reum and Su-yeon swirl around the Terminal 2 offices.
Yeo-reum meets her roommate. In-u mishandles a security checkpoint incident. A scuffle with a smuggler creates a rift between Na Yeong-ju and O Dae-ki.
Su-yeon reveals his arm to Choe Mu-ja and makes a request. Yeong-ju notices an elderly passenger waiting in the same spot in the airport for two hours.
Yeo-reum runs into an old bully from school. Dae-ki loses his two-way radio, which is used to taunt him. Su-yeon realizes why his arm malfunctions.
Lee U-taek is suspected of accepting bribes. Su-yeon tries to remain unemotional around Yeo-reum, and later recognizes the man with Dae-ki's radio.
When the stalker manages to get away, Su-yeon takes matters into his own hands. Yeo-reum and Su-yeon go on a double date with Yeong-ju and Dae-ki.
Choe Mu-ja questions Mr. Jang, who reveals the worries he has about the prosthetics' effect on Su-yeon's health. Gong Seung-cheol is hit by a scandal.
Heavy fog at the airport keeps the Terminal 2 team busy. Worried about Su-yeon's health, Yeo-reum tries to persuade him to stop wearing his prosthetics.
A flashback reveals the rest of the story behind Su-yeon's accident. When an increasingly ill Su-yeon disappears, his co-workers mobilize to find him.
In-u is given a chance to right the wrong he committed 12 years earlier. Su-yeon makes a decision about his future that greatly upsets Yeo-reum.