"Flex X Cop" Episode 13 featured a surprising twist as Ahn Bo Hyun made a shocking discovery with Kwak Si Yang.

The action comedy K-drama focuses on the life of a third-generation chaebol named Jin Yi Soo (Ahn Bo Hyun), who finds himself working as a detective after unexpectedly solving a crime. Since his father is running for mayoral's seat, he wants his son to enter the police force to pacify the incident involving his family.

Initially, team leader Lee Kang Hyun (Park Ji Hyun) and the rest of Team 1 oppose Jin Yi Soo being part of their group; they eventually embrace him and see him as an asset to the team.

'Flex X Cop' Rating: K-Drama Exhibits Tight Competition With 'Wonderful World'

As the drama nears its finale, "Flex X Cop" Episode 13 continues to stay strong in the ratings race.

In a report by Nielsen Korea, the K-drama recorded an average nationwide average of 8.3 percent, showcasing tight competition from its competitor "Wonderful World," starring Cha Eun Woo and Kim Nam Joo, after garnering an average nationwide rating of 9.9 percent.

'Flex X Cop' Episode 13: Jin Yi Soo Discovers Stepbrother Jin Seung Joo's True Colors

With only a few episodes left, "Flex X Cop" Episode 13 depicted the true colors of Jin Yi Soo's stepbrother, Jin Seung Joo.

After Lee Kang Hyun was able to uncover the real corrupt official by exposing the Oryun Community, she was able to clear his father's name, who was framed by his colleague.

Meanwhile, Jin Yi Soo's past came to haunt him. The night when Team 1 successfully warped up the case, an unknown person entered the residence of the Hansu chairman. The dead body was found by their gardener and Jin Sung Joo's mom.

Meanwhile, Jin Yi Soo was confused about why their team went to his father's house, and right then and there, they found the dead man.

The family, Jin Seung Joo and his mother, told the cops that they didn't know the man.

As for the chairman, running for the mayoral seat, he assured the public that the man was not associated with his family. He also promised to take responsibility if it was proven that the man had a connection with any of the family members.

At this point, Jin Yi Soo was being targeted by the media, calling him names like an "illegitimate chaebol."

Moreover, the cause of his mother's death was also brought up by the media.

Because of the negative reports about Jin Yi Soo, Lee Kang Hyun's father, now the superintendent of the police station, advised his daughter that they would be removing Jin Yi Soo from the investigation.

In addition, he also told his daughter not to get associated with Yi Soo because he was a "ticking time bomb," but Lee Kang Hyun reminded him that he was the one who saved her from the near-death experience.

In the last scene, the team got a tip regarding the possible suspect. However, this was where Jin Yi Soo discovered that one of the suspected persons was his brother.

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Written by Geca Wills