9 timestamped notes explaining the Korean cultural context in this episode — customs, idioms, food, honorifics, and history, at the moment each appears on screen. These notes discuss events across the whole episode. To see them revealed scene-by-scene as you watch, use the episode page to find an airing.
The older Jung-woo is drinking at a 포장마차 (pojangmacha), a tented outdoor stall selling cheap alcohol and simple snacks. These canvas-covered carts are scattered all over Korean cities and are a go-to spot for anyone who needs to cry into a bottle of soju away from home. The owner's loud, fussy warmth toward customers is completely typical of the pojangmacha experience.
Young Yeong-hun is studying at a 독서실 (dokseosil) — a paid, silent study hall where Korean students rent a private desk by the hour or month. The owner remarks that it's Christmas Eve and the place is empty because everyone has gone out, treating it as a sign of how unusually dedicated Yeong-hun is. For Korean students in the early 1990s, 독서실 were a daily fixture of life.
Sun-woo's recorded message explains that his brother obtained a single incense stick (향, hyang) that sends the user exactly 20 years into the past. The drama uses this as its central sci-fi hook. Each stick burns for a limited time, so every trip back is precious and finite — Sun-woo says he has already used two and has seven left.
Sun-woo mentions that catching Choi Jin-cheol (최진철) in 1992, when he was still a small-time operator, would be far simpler than the national scandal unfolding in the present. This kind of thinking — going back to stop a powerful villain before he rose to power — is a classic Korean dramatic fantasy, reflecting real public frustration with chaebol-linked corruption cases that drag on for years.
Sun-woo notes that Jung-woo's love interest, Yu-jin, is four years older, a widowed mother, and a former band vocalist — each detail piling up into exactly the kind of match a traditional Korean father would refuse. Parental veto over a child's romantic partner, especially on grounds of age gap, prior marriage, or social standing, was intensely common in early-1990s Korea and remains a dramatic staple.
The film young Sun-woo and So-ra are going to see is 'The Bodyguard' (보디가드), the 1992 Kevin Costner–Whitney Houston Hollywood blockbuster. It was a massive hit in Korea that year, and its soundtrack — especially Whitney Houston's 'I Will Always Love You' — became a cultural touchstone. Mentioning it instantly pins the flashback firmly to late 1992.
An optician (안경사, an-gyeongsa) fixes Myeong-hui's glasses right there at the shop while Sun-woo waits with her. Street-level and mall-level eyewear shops in Korea typically offer on-the-spot repairs and even same-day lens grinding, so getting glasses fixed within minutes is completely ordinary and not played as lucky — just convenient.
Min-yeong reveals her birth name is Yun Shi-a, changed to 'Min-yeong' after her mother consulted a 점쟁이 (jeomjaengi, fortune-teller) who said the original name carried bad luck. Renaming a child based on the advice of a saju (사주, birth-chart) reader or fortune-teller is a real and not-uncommon practice in Korea, sometimes requiring an official family-register amendment. This throwaway personal detail is what triggers Sun-woo's shocking realisation.
Sun-woo wonders aloud whether he can live normally holding two sets of memories — the original timeline and the altered one. This dilemma is the emotional spine of the show: every trip back doesn't erase his knowledge of what was, so he carries grief and joy simultaneously. The phrase '두 개의 기억' (two memories) is the drama's way of naming that impossible emotional weight.