Mi Soon successfully took the ledger from director Myeong's office. She handed it to the team while Myeong is furious as he found out the ledger was lost.
Ye-eun gets blackmailed by one of their enemies, using her daughter So Hui as a bribe. She needs to get the ledger and deliver it to the mystery caller. The ledger uses an invisible ink, Ye-eun thought of it and as they use a light, the letters appear. Team leader Dong carefully transfers all the notes on the ledger to another notebook.
Meanwhile, assistant Byun Woo is suspicious of Chan Mi. He thinks of her as the person he fought with at Myeong's office the other night. Byun Woo also gets scratch on his face while Chan Mi receives a wound on her hand.
CEO Seok Ho is worried looking at his assistant and Chan Mi getting all wounds on their body. Byun Woo admitted to Seok Ho that he failed to get the ledger since another person is working up to get hold of it. Byun Woo checks Chan Mi's file in the company.
Dong and Ye-eun collaborated to capture the mystery caller who blackmailed her. They put a hidden camera and a tracker on the ledger. As Ye-eun gave to the person inside the car, it led them to Cheif Seo's office. They are all shocked as their NIS chief officer is the traitor. Dong arrested Chief Seo while they gathered more evidence to put him in jail.
Meanwhile, Ye-eun was able to access the NIS records and found out the cause of the death of her husband, former NIS agent Kwo Min Seok.
CEO Seok Ho found out the true identity of Chan Mi. He confronted her and asked a lot of questions about why she chose to lie for a long time. Chan Mi, on a mission, cannot tell Seok Ho the truth why she made the undercover. She walks away without any answer. The next day Chan Mi is relieved from work at Il Kwang Hitech.
Ye-eun looked for Chan Mi and found her outside Hitech. Chan Mi took all her things as she ended her job for good. She confronted Chan Mi about her husband's death. Chan Mi took out the ring she got from Min Seok at the hospital and gave it to Ye-eun. She admitted her carelessness that caused Min Seok's death during their operation.
Ye-eun cried after knowing the truth after a long time and as they worked together in Good Casting. Chan Mi asked forgiveness from Ye-eun for losing a husband and a father to So Hui. She promised to catch Michael and make him pay for what happened to Min Seok.
It was a long day for Chan Mi as she lost her job and admitted to Ye-eun about her husband's death. She went out to play at the shooting range to lessen her stress.
On her way home, she bought a bag of beer at the convenience store. Team leader Dong was there eating his hot ramyeon. They talked about Ye-eun's situation and how Chan Mi become impulsive in handling missions. Dong advises her to control her feelings and focus on what is important. He left Chan Mi while immersed in her thoughts about Ye-eun.
Chan Mi received a call from Taek, and they are ready to make a deal. She needs to get the video from Taek, exposing who Michael is.
