Seo Do Young

Han Dong-soo, a struggling lawyer, is struggling. After nearly losing his license due to a false accusation, he was forced to leave his position at a major law firm. Now he's forced to eke out a living through small cases, specifically providing legal assistance to inmates at a local prison, hoping that one of them will hire him. His younger half-brother, Han Bum-jae, works at a used computer store and helps him find clients. One day, Dong-soo is approached by an inmate named Seo Do-yeon, a former baseball player who is the second-in-command in one of the Yeosung crime groups. Described as a handsome man with a wickedly cruel personality, Do-yeon asks the lawyer to spy on his girlfriend while he's in prison for a substantial fee. Struggling financially, Dong-soo agrees to the assignment, despite his own doubts. Taking on this seemingly simple case of jealousy, Dong-soo has no idea that a far more dangerous reality lurks behind it. As he carries out his assignment, he begins to delve into a world of gangster intrigue and power struggles.

Lawyer Han Dong-soo and his brother, Bum-jae, continue to monitor Do-yeon's girlfriend, Park Jae-yi, but find nothing suspicious. However, instead of calming down, Do-yeon becomes enraged. In prison, he threatens Dong-soo, reminding him of his family and demanding that he find any evidence of infidelity before his release, which is scheduled for a few days. Realizing something fishy is going on, the brothers decide to dig deeper. Their investigation leads to a shocking discovery: a conspiracy is brewing within Do-yeon's gang. It turns out that his girlfriend is cheating on him with a gang member, and together they plan to kill Do-yeon. To obtain evidence, Dong-soo and Bum-jae infiltrate Jae-yi's house and install hidden cameras. Inside the house, they find something unexpected: a man hooked up to life support, who is later revealed to be the real gang boss mentioned by Dong-soo's former colleague.
Dong-soo realizes he has become embroiled in a power struggle within the criminal underworld.

The next evening, Dong Soo broke into Jae Yi's house while she was out and wanted to take the video cameras containing evidence, when suddenly...

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