Episode 5 of "My Dearest Nemesis" kicks off with an intriguing scene where Ha-jin catches a glimpse of Ju-yeon and Su-jeong standing in front of her restaurant. With a sense of foreboding, she issues a cautionary warning to Su-jeong, prompting the latter to swiftly seize Ju-yeon's hand and dash into a nearby alleyway, leaving Ha-jin utterly perplexed. It isn't long before the penny drops for her, realizing that Su-jeong's supervisor and the feared Black Dragon are one and the same.
In the meantime, Su-jeong confides in Ju-yeon, alerting him to the presence of her former lover, the scammer. Unexpectedly, she finds herself taken aback by the solidity of his chest, amusement sparkling in her eyes as he playfully fishes for more compliments. As they await her bus, she presents him with a toy she won at the arcade—a fake Toggaengyi, an identical replica of the one his parents gifted him. Despite grumbling about piracy, he refuses to relinquish it.
The next day, Ha-jin delves deeper into the enigmatic relationship between Su-jeong and Ju-yeon. Su-jeong defends Ju-yeon's character, acknowledging that her initial impression was unfavorable yet insisting he's a kind person. However, when Ha-jin inquiries about Black Dragon, Su-jeong draws a stark contrast, withholding any positive sentiments.
Following their heart-to-heart, Ha-jin's sharp eyes spot Shin-won socializing with Ju-yeon. She swiftly intervenes, pulling Shin-won aside. A nostalgic flashback unfolds, showing Shin-won introducing Ju-yeon to the gaming world, highlighting Ju-yeon's playful and endearing traits. Post-rejection by Su-jeong, his demeanor shifts, a chill settling over his once warm demeanor.
In the present, Ha-jin fills Shin-won in on the unfolding saga. Both are startled and deeply concerned, foreseeing a catastrophic outcome if Su-jeong and Ju-yeon's burgeoning feelings lead them to uncover the truth.
At home, Su-jeong beams at her Toggaengyi, while Ju-yeon places his fake counterpart beside the authentic one, a poignant symbol of their intertwined fates.
Unbeknownst to them, the Plan Separation quietly unfolds. Ha-jin devises a scheme to lure single men to Su-jeong's restaurant by advertising free meals, all in an attempt to set her up. Meanwhile, at the office, Shin-won exerts his utmost to keep the budding romance between our couple at bay. He falsely claims that Su-jeong harbors interest in a fellow colleague, hoping this news will incite Ju-yeon to terminate her employment due to his aversion to office romances. Ironically, this maneuver backfires, as Ju-yeon finds himself daydreaming about the possibility of Su-jeong's affection towards him.
Elsewhere, Na-na inadvertently reveals that Shin-won had inquired about Su-jeong, catching her off guard. Puzzled, Su-jeong requests a meeting with Shin-won after work. Naturally, Ju-yeon catches wind of this and hastily claims concern for her wellbeing, rushing to the scene. Witnessing her smile, he is mistakenly wounded, believing she is interested in Shin-won. In reality, Su-jeong suspects Shin-won has issues with her and is a conspiracy that puts her out of a job. She confronts him head-on and storms off.
Ju-yeon, unable to shake off thoughts of their supposed "date," unexpectedly turns up at Su-jeong's place, driven by a desire to protect her from Shin-won, whom he perceives as a playboy. Surprised by his genuine concern, Su-jeong unburdens the truth to him. Relief washes over Ju-yeon, but then she ponders aloud what might transpire if she did fancy Shin-won. His immediate response hints at intervention, fueled by his dislike for the idea. This revelation startles her.
At work, the female supervisor makes a drastic switch, dropping Ganghan Farm, a brand that refuses collaboration. Su-jeong is visibly upset, and the supervisor goads her into personally convincing Ganghan to come on board. As she departs, Kwon updates Ju-yeon, acknowledging the immense impact Ganghan's involvement could bring, given their reluctance to align with any corporation.
Ju-yeon arrives at the village precisely when Su-jeong's introduction to CEO An of Ganghan takes a turn for the worse. Compounding the issue, CEO An harbors a deep-seated disdain for chaebols, prompting Su-jeong to introduce Ju-yeon as her younger brother in a desperate bid to smooth over the situation.
In solitude, she was astounded by his unexpected arrival to lend a hand. He asserted that tireless labor could sometimes breed solitude. Nevertheless, he was irritated when she introduced him as her brother. She countered, insisting that calling him her boyfriend would have been even more perplexing, which only deepened his confusion.
On the farm, they chose to undertake chores in hopes of impressing CEO An, a formidable figure. During a heated exchange, Su-jeong lost her footing, and Ju-yeon, attempting to rescue her, ended up with both of them tumbling into a feeding trough.
Back in the bustling city, Shin-won visited Ha-jin to devise a Plan B, realizing that Su-jeong and Ju-yeon were as inseparable as two peas in a pod. However, instead of brainstorming, they found themselves bonding over shared love for novels. By the session's end, Ha-jin realized they hadn't crafted a new strategy at all.
That evening, CEO An graciously invited Ju-yeon and Su-jeong to dine with her, still honoring them as her guests. Over a meal, the couple bickered incessantly about the bitter side dish served, with Ju-yeon persistently addressing Su-jeong as "noona," which annoyed her. An's grandson called, and Ju-yeon was touched by the warmth of her affection for the boy. However, Su-jeong seized the moment to pitch her idea – that any trendy brand could replace Ganghan, but her true goal was to enrich An's family.
Lost in contemplation, An watched as Su-jeong accidentally consumed homemade liquor, unaware of its strength until Ju-yeon pointed it out. Unable to drive home intoxicated, An kindly offered them a place to stay for the night.
After An retired for the evening, the couple shared drinks and gazed at the stars. Su-jeong confessed that she had faced bullying for being motherless, stating her dislike of being looked down upon and her constant drive to prove herself. Ju-yeon echoed these sentiments, and they were astounded by their striking similarities. They joked about their respective disastrous first loves and toasted to it, leading to a montage of their increasing intoxication.
Ha-jin called to check on Su-jeong, who insisted everything was fine. Ju-yeon, like Su-bin, didn't register in her mind as a romantic interest. Overhearing this, Ju-yeon felt hurt. As My Dearest Nemesis Episode 5 concluded, he kissed her, asking if she still failed to see him as a man. They kissed again, deepening their connection.
