In the gripping sixth episode of Season 1 of "Butterfly," the narrative resumes with Gun's daring abduction of Rebecca, leaving David scrambling to respond. Without hesitation, he seizes a bicycle and sets off in hot pursuit, yet fate deals him a cruel hand as he ultimately loses sight of them.
Determined to rescue Rebecca, David races back to his in-laws seeking reinforcement. His father-in-law, struck by David's desperation, agrees to equip him with a small contingent of soldiers and artillery, on the premise that David owes him a future favor. Meanwhile, Eun-ju's anxiety lingers over Rebecca's unwillingness to sever ties with her past. She cautions David to tread lightly.
Elsewhere, Juno's persuasive prowess works wonders as she convinces Rebecca to rejoin her ranks. Painting a picture of Rebecca's continued relevance as an operative, Juno exploits David's yearning to save her against him. Yearning for acceptance, Rebecca falls prey to Juno's soothing words and willingly accompanies her, planning an exodus via a private jet. Juno, though disheartened by Oliver's misplaced suspicion of her attempted assassination, insists she doesn't want to lose Rebecca—or so she claims.
David and his men strategically intercept Juno and Rebecca en route to the airport. In a daring maneuver, David boldly blocks their path, guiding the convoy precisely where he intends. The stage is set for an intense confrontation between David and Gun, culminating in a graphic scene where David slits Gun's throat, while Rebecca dispatches the remaining operatives and trains her gun on Juno.
Tempted as he is to end Juno's life, David relents under Rebecca's plea. Seeing Juno as kin, Rebecca cannot bring herself to pull the trigger. Juno, seeing an opening, extends an invitation for David and Rebecca to join her new venture, only to be rejected. Instead, they issue a stern warning, daring her not to cross them again.
Parallel to these dramatic twists, Dawson and an FBI task force storm Caddis in a bold bid to secure crucial evidence, adding another layer of intrigue to the unfolding saga.
The conclusion of Butterfly Season 1 unfolds with dramatic intensity. Juno boards her opulent private jet, bidding adieu to her native land with dreams of rekindling her clandestine operations in a foreign soil. As she ascends into the skies, Oliver reaches out to her via phone call. In a poignant moment, Juno expresses heartfelt remorse for her shortcomings as a mother and confesses to the sorrowful tale of Baron, Oliver's beloved dog whom she had ruthlessly eliminated in his youth. She clarifies her innocence regarding any assassination attempts on Oliver, while he, in turn, acknowledges his guilt for betraying his mother. Despite Juno's reassuring forgiveness, the fragile connection is disrupted by a fading signal, leaving Oliver's words unheard.
Meanwhile, David and Rebecca embark on their journey back to Seoul, where David attempts to glean insights from Rebecca about their recent encounters. Rebecca, however, fabricates her conversation with Juno, to which David responds with unexpected leniency, assuring her that she need not unveil the truth.
Later that evening, the family gathers for dinner, where David and Eun-ju ponder the prospect of relocating to America, with Min-hee enthusiastically suggesting Hawaii as their potential paradise. As they prepare to depart, Eun-ju requests a brief visit to the restroom, and Rebecca kindly offers to accompany her, leaving David and Min-hee behind.
Minutes stretch into an eternity for David, who becomes increasingly concerned by the prolonged absence of the two women. His suspicions mount to a crescendo when he forces open the restroom door to find Eun-ju lying in a pool of her own blood, her throat brutally slit. Rebecca is conspicuously absent, her whereabouts a mystery. In a desperate bid for clarification, David pleads with Eun-ju, but her silence speaks volumes of her inability to respond. The episode concludes on a harrowing note, with David's anguished cries for Rebecca echoing through the eerily silent restaurant.