Episode 10 of "Cinderella at 2 AM" kicks off with an idyllic scene of Yoon-seo and Ju-won at the campsite, their tranquility shattered when news of Ju-won's father's scandalous affair reaches him. Abruptly, Ju-won is summoned back to the office, where the revelation of his father's double life—living abroad with another woman and now seeking divorce, claiming his marriage was a mere facade—sends shockwaves.
The chairwoman, in a surprising turn, reaches out to Yoon-seo, granting her blessing for her union with Ju-won. However, she imposes a condition: Yoon-seo must divulge her background to bolster the company's public image. Entrusting her with oversight of the scholarship fund, she exhorts, "Be the embodiment of a genuine Cinderella."
Yoon-seo confides in I-rae about the development, her demeanor unfazed but her thoughts consumed by concern for Ji-suk. Little does she know, Ji-suk has overheard their exchange and confronts Ju-won at the company, exposing his mother's ill-mannered treatment of Yoon-seo. Promptly, Yoon-seo tracks Ji-suk down, gently escorting him home.
Upon her return, Yoon-seo and Ju-won convene with Si-won and Mi-jin, delving into the matter. Si-won, remorseful for his mother's actions, offers an apology. Ju-won's anger simmers, yet Yoon-seo offers a compassionate perspective, attributing his mother's behavior to emotional turmoil. Recognizing their mother's distress and long-standing loneliness, the brothers decide to intervene, orchestrating a mandatory getaway for her.
Their foray into family bonding, however, is marred by hilarious moments of miscommunication and disarray as they realize they know little about each other. Their vehicle's untimely breakdown adds to the comedic chaos, but amidst the frustration, the chairwoman's antics bring laughter and a sense of unity. Ju-won reveals to his mother that it was Yoon-seo's idea to embark on this journey, fostering a newfound appreciation.
In a heartfelt confession, the chairwoman reveals that Yoon-seo's reluctance to disclose her past stemmed from a desire to shield Ju-won from pain. She wholeheartedly endorses their union, urging them to tie the knot promptly while assuring them that Yoon-seo's family history will remain a closely guarded secret.
Two months have elapsed, and the wedding preparations for the couple are in high gear. Yoon-seo has embarked on a new journey, joining the scholarship foundation, eager to unravel the intricacies of her new role as a novice. Ju-won, however, finds himself at the helm of the wedding arrangements, as Yoon-seo's commitments keep her constantly occupied. This discrepancy sparks a heated discussion between them at I-rae's restaurant, where tensions rise.
Meanwhile, amidst the flurry of weddings, Si-won and Mi-jin's anniversary passes unnoticed. Their dinner together turns sour when Mi-jin realizes that Si-won has forgotten their special day, with his assistant stepping in to arrange the necklace gift and restaurant reservation. Hurt and disappointed, she abruptly leaves the table.
Fate intervenes as Yoon-seo, out and about, mistakenly dials Mi-jin's number, leading to an impromptu rendezvous over drinks. Bonding over their shared frustrations with their partners, the two women, fueled by alcohol, devise a plan to confront their mother-in-law about her unwelcoming demeanor towards Yoon-seo. Word of this scheme leaks to Si-won when he calls Mi-jin, prompting both brothers to spring into action and race to their mother's abode to thwart the confrontation. Their efforts prove successful.
The following morning, Yoon-seo awakens to a text message of apology from Ju-won, accompanied by a request for hangover remedies. Over a breakfast she's thoughtfully prepared, they mend their differences, fostering a renewed understanding.
As they venture out together, their eyes catch sight of Seong-min's meticulously crafted wedding invitation, finally released into the world. Parallel to this, Si-won and Mi-jin too reconcile, exchanging heartfelt declarations of love. Ji-suk diligently continues his work at I-rae's restaurant, while Seong-min finds solace in painting once more. The episode concludes on a triumphant note, with the couple triumphantly tying the knot, having overcome every obstacle that stood in their way.
