The identity of the spy in SBS's 'Ghost' is quickly becoming a hot topic among Netizens.

The latest episode of the drama showed Woo Hyun (So Ji Sub), Hyuk Joo (Kwak Do Won) and Kang Mi (Lee Yeon Hee) realizing that there is a mole placed by Jo Hyun Min (Um Ki Joon), leading to spiking curiosity as to who the spy could be.

A USB drive containing evidence disappeared while Jo Hyun Min was visiting the police station, leading to suspicion that the theft was internal. Furthermore, it is revealed that the mole was one of the few who knew about detective Han's laptop, as well as someone within the department who knew of the phone call from detective Han before his death.

The obvious suspect is Lee Tae Gyun (MBLAQ's G.O.), who received detective Han's phone call and knew how to operate the laptop. However, there are three others who heard the phone call: rookie detective Byun Sang Woo (Im Ji Gyu), evidence analyst Kang Eun Jin (Baek Seung Hyun), and assistant analyst Lee Hye Ran (Bae Min Hee).

Adding to the intensity surrounding the issue of the mole is that the spy killed Yum Jae Hee on Jo Hyun Min's order and disappeared, making the spy all the more dangerous and raising viewers' curiosity and interest in the show to an all-time high.