Parental Neglect: Young-goon's mother is too busy/ashamed to seek help for her, and Il-soon's parents ignored him so much he thought he could turn invisible.
Raised by Grandparents: Young-goon's mother states that her mother (Young-goon's granny) raised her while talking to the doctor in the beginning of the movie, explaining Young-goon's love for her granny.
Take Off Your Clothes: When Il-soon pretends to install a device in Young-goon's back, he asks her to do this. Subverted as he's the only one who realises how awkward the request sounds.
Tin-Can Telephone: Il-soon uses one to communicate with Young-goon while in solitary confinement. He then sings her a song about Yodel Land.
Toplessness from the Back: Played with. When Young-goon takes her top off in front of Il-soon you'd certainly expect fanservice, however instead we get to see how incredibly thin she has become. Il-soon is clearly distressed by this, although he still caresses her back for good measure.
What Is This Thing You Call Love?: Young-goon is a cyborg, so she convinces herself she can't feel love and has difficulty returning Il-soon's feelings, although it's obvious she reciprocates.
Why Am I Ticking?: Granny tells Young-goon that she is not a cyborg but a nuke bomb, and her purpose it to blow up the world. Young-goon tries to go through with it.
Willing Suspension of Disbelief: The director has openly admitted that the mental institution as depicted in the film is deliberately the antithesis of what a real one is like. This was done for narrative purposes.
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