- Special Agent Lee is investigating a planned assault on a Congressmen who is tied to a series of GPS Spoofing cyber-attacks globally. The primary suspect is his junior agent Peng's ex, who was part of an underground hacker organization.
- Liu sits alone in the dark in an empty factory. He stares intently into a computer screen, which shows data being copied. He whips his head around from time to time. The phone rings, a call from Peng. But he doesn't answer. After the data finishes copying, he emails Peng and burns it in the trash can.
Elsewhere, Peng stands on the pavement and calls Liu but to no answer. Across the street, a cocktail lounge's was filled with people. In the private room was congressman Ren was holding a celebration banquet. A waiter enters the room with a bottle of whisky. Moments later, an escort stumbles out of the private room falling ill, behind her, everyone in the room had collapsed.
Morning, Peng rides the bus to work. She sits uninspired as she browsers the job sites on her phone. In front of MJIB building, a group of reporters surrounds Peng's Section Chief. Peng arrives, spots her friend ChenZiYun and quickly dodges pass. She receives a texts from Chen inviting her to lunch, she texts back but bumps into her team leader LeeBoYao as she enters the elevator and spills coffee all over him.
On the office floor, the atmosphere is tense. Peng and her colleague Wen discusses last night's events. The MJIB is investigating the incident last night, believing the intended target was congressmen Peng since on the same evening his proprietary anti-hacking invention was stolen from the DongYan factory. The national security threat is high since this is related to a series of international security breach incidents are commonly referred to as "GPS Spoofing". It is a new cyber terrorist attack tactic in recent years. Hackers invaded the GPS system and send interference signals to create chaos. DongYan Technology has joined forces with the US Advanced Defense Center and the Taiwan Academy of Sciences to jointly develop a product that defends against GPS Spoofing two years ago, called "Anti-Intrusion Navigation System-AT20". DongYan is currently headquartered in the Nangang area of Taipei. The company's predecessor was a computer parts factory, Dongsheng Electronics. During the meeting, Lee takes out a pen from his suit pocket, but realized the business cards his pocket had been stained with coffee. At noon, Peng meets Chen for lunch. As Peng comes to meet Chen, she sees Lee taunting Chen, demanding she request for information through the proper channels as opposed to ambushing people at the door. Chen defends the reporter's right to reveal the truth to the public and refuses. Lee hands Chen a business card and leaves. Peng waits for Lee to leave before coming to meet Chen. At lunch, Peng tells Chen her ex-boyfriend Liu asked her to meet out of the blue the night prior, but he never showed up. Chen laments that she never liked Liu since he was an eccentric geek. Peng and Liu broke up when he left to study abroad with full ride scholarship. Peng receives a call from the office and their lunch was cut short.
Elsewhere, the US Advanced Defense Center representative Mr. Yates arrives to Taipei and is en route to city center. Irritated, he shouts to someone on the phone when his ride is interrupted by a man in black on motorcycle. The motorcyclist shoots his driver then shoots him.
On her way home, Peng learns of the news and looks concerned.
The next morning, Peng was awakened by noises outside the door. She also receives an odd text message from Liu. Just as she was about to answer the door, she picks up a call from Chen, who tells her the news revealed Liu as the primary suspect in the DongYan cases and she is a named accomplice. Chen persuades Peng to escape and rushes by to pick her up.
The MJIB launches an investigation into Liu and Peng with Lee leading the task force. Liu is the main suspect; The intelligence unit dig up their past relationship and also finds Peng contacted Liu several times in the last few days via email, text and phone calls. Lee decides their primary objective is to track them both down.
In the car, Peng pleads her innocence to Chen when she receives a call from Lee. Lee calls from Peng's residence which has been sealed off, he asks her to come forward, but Peng insists on her innocence and hangs up. Peng searches for clues and re-examine the email Liu sent her that night. The content is blank, but the size is 25MB. Peng discretely contacts Wen, asking his help to check the email contents, in exchange she agrees to let him track her phone's GPS location.
Wen discovers Liu's email has hidden encrypted attachment, with only 5 password attempts allowed before the file is permanently destroyed. Peng tries three passwords to no success. Peng remembers Liu had a shack in the mountain where he spent a lot of time in university, she finds the address and asks Chen to take her there.
Peng and Chen arrived at Lee's shack. The shack has been ransacked, and this looks to Liu's secret base with computer equipment. In here Peng had a flashback of Liu telling her about the responsibility for maintaining fairness and justice, and idea of sacrificing the self for the greater good.
At the office, Wen's colleague uncovers the security footage on the night of the incident that places Peng near the scene of the crime by the cocktail bar. Wen decides to tell Lee about the phone call with Peng and gives him her GPS location.
Before leaving the shack, Peng finds a hide-a-key in the back door and finds several empty boxes and mail labels. In the car, Peng showed Chen the label; Peng remembers the logo as that of Dongsheng Electronics. The factory should have been abandoned a long time ago, and there's no reason he should be receiving parcels and letters from them.
At dawn, Peng and Chen arrived at the factory and finds a crew preparing shipments. Peng asks Chen to leave and sneaks into the factory alone. Lee follows her GPS location to the factory, and asks Wen to send drones ahead to scout out the place. Using thermal imaging, Lee learns the approximation floor plan and the terrorists' setup of the factory. Lee asks Wen to dispatch the SWAT team and setup snipers on location to act on his cue.
Peng sneaks upstairs and finds Liu severely beaten. He told Peng that this was not his intention and faints. As Peng tries to get Liu to wake up, the terrorist crew barges in holding Chen hostage; and to Peng's surprise, the leader was Professor Zhao from university. They hold Chen at gun-point and forces Peng to remember the password. Peng remembers Liu's dying words and, and finally understood the password was thegreatgood. After Peng opens the attachment, Zhao shoots and kills Liu. With Lee's lead, the MJIB team floods the scene and Zhao was shot dead by a sniper. Peng and Chen are rescued.
Wen explains to Peng that Professor Zhao helped Lee obtained his master's degree and got him the job at DongYan. The encrypted data Liu sent Peng contains the design of AT20. Wen believes Liu was killed because he was turning on Zhao.
Lee searches the factory and finds a monitoring room with a locked inner room. He checks the security surveillance monitors and finds it suspicious Peng was able to sneak in without anyone spotting her. Once the inner room has been breached, Lee also finds his tea-stained business card on the ground. It was the card he gave Chen yesterday, but now it appears in the locked room.
Peng apologies to Chen for getting her involved and as she accompanies Chen to her car, she drops her purse and Liu's phone fell out of her purse. Peng realizes Chen was in on this all along, Chen attacks Peng.
Lee and team corners Chen who held Peng hostage. Chen says she and Liu acted for Zhao to eliminate these traitors who took advantage of them for their own interests. As Chen was about to shoot Lee, Peng grabbed Chen's hand a shot fires through her abdomen, injuring Chen behind her. Lee captures Chen as Peng falls to the ground unconscious.
Through the information sent by Liu, the MJIB uncovered Zhao's scam. Zhao used his status as professor to brainwash student including Chen, Ren and Liu. Zhao and his accomplices runs the scam of creating a series of global cybersecurity attacks in to cause unrest and in turn sells the AT20 device to them to profit. Liu had a change of heart and planned to expose Zhao; Lee makes a series of arrests with the evidence he uncovers and bring Chen and Ren to justice for their crimes. Peng assisted in breaking through terrorist organizations, was appreciated by Lee, and has a new appreciation of her career ahead.
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