A police detective who loses everything to a criminal organization seeks playback when he gains special abilities through biotechnology.
After suffering a tragedy at the hands of a violent criminal group, a blind Kang Gi-beom receives an operation for a special new pair of eyes.
On a team mission at the ARGOS leader's wedding, Gi-beom runs into someone who haunts his memories. Hwang Deuk-gu is tired of playing underling.
While ARGOS leadership engages in a power struggle, Gi-beom wonders about the origins of a dangerous device retrieved from a dead man's head.
Gi-beom's disobedience comes with consequences. When Deuk-gu unleashes chaos at a jazz club, Lee Gwang-cheol faces a chilling situation.
Left with no one to trust, Choi Ye-won realizes she needs protection. An alarming package leads the team toward a horrific ARGOS hideout.
After planting a listening device, Gi-beom makes an unexpected discovery. Han Tae-woong recalls the tragedy that brought him to RUGAL.
A high-level RUGAL employee is kidnapped. Song Mi-na sets out to bring him back, but soon comes across trouble of her own.
Gi-beom finds himself trapped. While trying to pinpoint his whereabouts, the team ends up at a crowded park — and witnesses a scene of terror.
Across the city, dead bodies crop up wearing signs that accuse Gi-beom of murder. Tae-woong delivers an ARGOS boss to the police.
Gi-beom loses control of his eyes, which have taken on a life of their own. Deuk-gu shocks RUGAL when he delivers a sinister message.
With a bus full of civilian hostages on the line, Gi-beom knows he must face Deuk-gu alone. Bong Man-cheol grapples with an ultimatum.
The RUGAL team rise to fame as masked heroes against ARGOS, which has become public enemy No. 1. Deuk-gu makes an unanticipated move.
Needing answers from Deuk-gu, Gi-beom frees him from the police. A tragedy leads to revelations of secrets that Choi Geun-cheol has been keeping.
Gi-beom resists when his eyes begin directing him to kill indiscriminately, and looks for access to a video of RUGAL's beginnings.
Soon after Gi-beom wakes up with no memories, a worrying turn of events threatens the team. Meanwhile, Ye-won witnesses Deuk-gu's fearsome power.
Tae-woong learns the whole truth in a painful confrontation with Geun-cheol. Gi-beom vows to put an end to Deuk-gu once and for all.