Warning: complete spoilers for all 16 episodes.
The premise and its reversal. The series begins with Go Dok-mi, a shut-in who spies daily on the man living across from her, being caught in the act — not by her object of observation but by Enrique Geum, a game designer visiting from Spain. The joke of the first act is that the wrong man has discovered her secret; the structure of the whole series is the working-out of that accident, as the intruder becomes the person who actually sees her.
Jin-rak's concealment. Oh Jin-rak, the webtoon artist across the corridor, has been quietly in love with Dok-mi and protecting her from a distance long before the story opens, drawing and living behind a cover. His entire arc is the collapse of the belief that guarding someone is the same as knowing them. Dok-mi's decisive line to him — that he had it wrong the whole time, that she is not the princess — is the series' formal rejection of the rescue narrative, and it is delivered by the woman being rescued rather than by a rival.
The buried wound. Dok-mi's retreat from the world is traced back to Cha Do-hwi, her former friend, whose reappearance forces the past into the present. Crucially, the drama does not use this as a single detonating twist; it releases the history gradually so that the audience's understanding of her withdrawal deepens rather than flips. Her writing about onlookers who never measure the depth of a scar is the retroactive key to every scene of her hiding.
What the finale refuses. Episode 16 is organized around the difference between what each character thought love was and how that idea changes once they experience it firsthand. The show pointedly declines the tidy resolutions available to it: Do-hwi and Jin-rak are not paired off, and the wholly destroyed friendship between Dok-mi and Do-hwi is not repaired. Read after the fact, this is the payoff of the show's ethics — it has spent sixteen episodes arguing that some damage is real and permanent, so manufacturing forgiveness would have falsified everything.
The romance's resolution. Dok-mi and Enrique, described in the finale's own terms as two vastly different soulmates who bumped into each other by chance, choose to hold on to their love with maturity and honesty, cherishing the road they took together even though the future cannot be predicted. There is no promise of permanence — the show explicitly builds its happy ending on uncertainty.
The time jump. A year later, Enrique is in Spain making his animation. He will go back for the project, but not immediately; he is the one person who knows exactly what is important to him, and it is the person standing next to him. The distance that would be an obstacle in a conventional romance is reframed here as proof: two whole lives, deliberately kept in contact.
The final image and its hidden meaning. Dok-mi is still referring to herself in the third person, and the last beat shows her opening a new file titled That Woman's World. On first viewing it reads as a charming writerly flourish; after the full series it lands as the thesis. The woman who spent her life watching the world through a curtain has not become someone else — she still narrates herself from a slight remove — but she has converted that distance from a symptom into a craft, and from a private diary into a world she intends to publish. The voyeur has become the author.