Kim Do Hyung is a straight-laced banker who has just proposed to his longtime girlfriend, Yoon Joo Young. When Joo Young disappears, Do Hyung finds that the police department is not as anxious to find her as he is.
Do Hyung finds a phone number in the car he bought for Joo Young. He follows that lead to figure out where his missing girlfriend is.
Captain Yoon Mi uses cameras to track Do Hyung and Hak Soo's movements prior to Joo Young's disappearance. Do Hyung tells Yoon Mi how he and Joo Young met.
Do Hyung is released from police custody and takes matters into his own hands. Another one of Joo Young's secrets is revealed.
Joo Young is captured by Shadow. Meanwhile we learn about Do Hyung and Joo Young's high school days.
Do Hyung learns about Joo Young and Yoon Mi's connection. A secret about Captain Park is revealed.
Do Hyung attempts to save Lee Jang Ho. Captain Yoon Mi and Do Hyung track down Park Tae Gyu.
Joo Young's suicide attempt lands her in the hospital. Do Hyung finds out about Joo Young's miscarriage.
Joo Young is captured again by Shadow. Director Seo convinces Tae Gyu to take the blame for Hak Soo's death.
Do Hyung and Tae Gyu rush to save Joo Young and Mi Sook. Director Seo faces Chairman Kang's wrath.
Joo Young is presumed dead and her body cremated. Do Hyung is rushed to the hospital.
Director Seo pays a surprise visit to Do Hyung's bank. Meanwhile, Hyung Sik reveals a secret to Yoon Mi.
Ha Eun is rescued and taken to the police station. Lee Jin Sook obtains important information from The Glove.
Do Hyung and Yoon Mi rush to find Director Seo after Son Hae Jung smuggles him out of the hospital.
Do Hyung and Joo Young's reunion is shortlived. Captain Cha and the rest of the police force deal with the aftermath of Detective Park's death.