In the riveting tenth episode of Uncle Samsik, titled "Doubt," the narrative unfolds a complex web of mistrust and deception that sows the seeds of discord between the central characters, Samsik and San. The episode commences with the trial of Assemblyman Park, ensnared in accusations of bribery. The real Kim Kwangmin is not the culprit; instead, it is Han Soo who masquerades as Kwangmin, offering to construct a bridge for the assemblyman's benefit. This ploy aligns perfectly with Samsik's intricate scheme, further complicated by the real Kwangmin's own testimony against Assemblyman Park.

As the trial unfolds, Han Soo confesses to being a pawn of the Dongdaemun criminal organization, implicating Yoon Pal-Bong as the orchestrator of the bribery. Yeo-Jin, having encountered the genuine Kwangmin, becomes increasingly suspicious of the unfolding events. San, too, finds himself questioning the integrity of Samsik's actions, especially after Yeo-Jin confronts him about the inconsistencies in their narrative.
The tension escalates when San, clad in a suit gifted by Rachael Jung, confronts Samsik about the introduction of Palbong to Yeo-Jin. This encounter plants a seed of doubt in San's mind, as he begins to question Samsik's motives and the authenticity of their alliance. The revelation that the Sineui Alliance papers were spared from the flames by Park adds another layer to the plot, hinting at a deeper conspiracy at play.
In a shocking twist, a military figure emerges, disclosing that Palbong was receiving instructions from the North, casting a shadow of treachery over the proceedings. The disclosure suggests a plot to frame the deceased Choo In-Tae as part of a larger scheme to secure Kang's electoral victory.
Meanwhile, San orchestrates a strategic withdrawal of Choi Hanrim from a coup operation to shield him from arrest. However, Samsik and Jang Doo-Sik remain in the dark about San's true intentions. Yeo-Jin's arrest on charges of espionage, due to her father's publications being used to decode secret broadcasts, adds to the turmoil.
Samsik, in a bid to preserve his standing with Kang, forges the original papers and presents them as genuine, thereby cementing his loyalty. Kang, relieved to be rid of incriminating evidence, entrusts Samsik with a new task: to steal ballot boxes as per Choi Minkyu's directive.
As the episode reaches its climax, San learns of Yeo-Jin's plight and implores Samsik to secure her release. He also uncovers the plan to steal the ballot boxes, but Samsik defends Kang, attributing the scheme to Minkyu's machinations.
The episode "Doubt" is a testament to the intricate storytelling and character development that has captivated audiences of Uncle Samsik. It showcases the precarious balance of power, the blurred lines between allies and adversaries, and the ever-present specter of betrayal that defines the series. As the characters navigate through a labyrinth of intrigue, the audience is left to ponder the true nature of loyalty and the cost of ambition in a world where trust is a rare and fragile commodity.