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무브 투 헤븐 — 유품 정리 업체 (Move to Heaven — trauma/estate clean-out services)
8:59
Jung-woo answers the phone as "Move to Heaven," the name of his small business. 유품 정리사 (yuphum jeongni-sa) — estate or legacy cleaners — is a real profession in South Korea that has grown as the country ages and single-person households increase. These specialists sort through the belongings of people who have died, often alone, packaging keepsakes for the family and handling sanitisation of the space. It sits somewhere between a removal firm and a grief counsellor.
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컵라면과 편의점 삼각김밥 (Cup ramen and convenience-store triangle rice balls)
14:34
Groo reads the deceased's diet as cup ramen — especially spicy Jin Ramen (진라면), a flagship Ottogi brand — and 삼각김밥 (samgak gimbap), the triangular rice balls sold in every Korean convenience store like GS25 or CU. Late-night "1+1" promotions (buy one get one free) on nearly-expired stock are common, which is why Jung-woo reframes Seon-woo's choices as budget survival rather than personal preference.
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고시원 (Gosiwon — study-room housing)
19:12
고시원 (gosiwon) literally means "exam-prep room" — they were originally cubicle dormitories for people cramming for Korea's notoriously competitive civil-service exams. Today they are the cheapest private housing available in Korean cities: tiny windowless rooms, shared bathrooms, and a common kitchen. Many young migrant workers and low-income earners live in them long-term, making Seon-woo's situation instantly recognisable to a Korean audience as precarious urban poverty.
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산재 (Sanjae — industrial accident compensation)
22:27
산재 is short for 산업재해 (san-eop jae-hae), the Korean workers' compensation system administered by the government. If a death or injury is officially classified as 산재, the employer faces financial liability and reputational consequences. The company executive is carefully arguing that because Seon-woo collapsed inside his gosiwon rather than on the factory floor, the death falls outside that classification — a real legal grey area that precarious and contract workers in Korea frequently encounter.
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수어 (Korean Sign Language) and Deaf parents
28:04
Seon-woo's mother communicates in 한국수어 (Korean Sign Language, KSL), a fully independent language distinct from spoken Korean. The moment she switches to sign — rendered in the subtitles as stage directions — while her spoken words are voiced-over by a flashback, is the drama's way of showing what Seon-woo heard: his mother's voice in his memory, even though she communicated through her hands. It underlines how much he kept her words with him at work.
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방송통신대학교 (Korea National Open University — 방통대)
33:21
방통대 is Korea's large public distance-learning university, offering affordable degree programmes entirely by correspondence and online. It is widely used by working adults — factory employees, small-business owners, soldiers — who cannot attend a traditional campus. Seon-woo mentioning it in his bank-book note signals that he was quietly studying in his off-hours, aiming for a qualification that might help him move from contract to regular employment.
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정규직 (Jeong-gyu-jik — permanent employment)
33:26
정규직 (permanent/regular employee status) versus 비정규직 (non-regular/contract work) is one of the sharpest social divides in contemporary South Korea. Regular employees receive full benefits, job security, and company welfare; contract workers at the same firm can do identical tasks for lower pay with none of those protections. For young Koreans from lower-income families, landing a 정규직 position is often described as a life-changing goal, exactly the dream Seon-woo expresses in his letter home.
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그루의 자기 조절 행동 (Groo's self-regulation through recitation)
37:26
When Groo is overwhelmed by the sirens and the crowd, he retreats into rapid, precise recitation of animal taxonomy — the scientific classification of a ray species. This is a form of self-soothing common among autistic people: the predictable structure of memorised information can help regulate sensory overload and anxiety. Korean viewers familiar with autism spectrum traits recognise this immediately as Groo grounding himself rather than shutting down.