12 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.
Korea has a significant Catholic minority, and getting married in a 성당 (seongdang, Catholic cathedral) is considered formal and prestigious. The bride's religion often determines the ceremony venue, so the older woman's Catholicism is the practical reason the wedding will be held in a church rather than a wedding hall.
Young Seon-woo is writing in his diary on the exact date his father died — December 31, 1992. Throughout this show, the diary serves as the physical link between the 1992 timeline and 2013, so the date-stamped entries carry enormous weight: they are both a personal grief record and a message in a bottle to his future self.
교모세포종 (gyomo sebosong) is glioblastoma, the most aggressive form of brain cancer. Young Young-hoon decodes the drug name 'Temodal' — a real chemotherapy medication used specifically for glioblastoma — to figure out what illness the future visitor is treating. In Korea, specialist knowledge like this carries instant authority, which is why his reading of the drug label feels so definitive.
In Korea, private hospitals are often family-owned businesses passed down through generations, making them both a livelihood and a matter of family honour. Watching Jung-woo sign away the hospital without a fight is devastating because he is surrendering not just property but the legacy his father built — and, implicitly, conceding ground to the man young Seon-woo suspects killed that father.
The 9 o'clock news (뉴스9) is the flagship prime-time bulletin in Korean broadcasting, and its anchor is one of the most publicly visible jobs in the country. Being named the youngest-ever main anchor at a network is the kind of career milestone Korean society treats as near-celebrity status, which is why the director holds it over Seon-woo like a constant debt.
룸살롱 (rum salon) are upscale hostess bars where customers book private rooms and are entertained by female staff — common settings for high-level bribery and corruption cases in Korean news. Gangnam, Seoul's wealthiest district, is associated with the most expensive and politically connected establishments, so the phrase 'Gangnam room-salon emperor' signals a scandal at the very top of money and power.
In this drama, a Himalayan incense stick is the object that lets Seon-woo travel back twenty years. Each use carries a physical cost — the headaches he can't shake are described here as the lasting 'residue' of having played with time. The idea that objects, memories, and even pain persist across timelines is the show's central metaphysical rule.
Hiking is one of the most popular leisure activities in Korea across all age groups, and gifting quality outdoor gear — especially branded jackets or equipment — is a respectful and practical present for older adults. Min-young and Seo-jun buying matching mountain gear for the professor and his wife follows a well-worn Korean gift logic: useful, sincere, and appropriately generous without being flashy.
The LP album Seo-jun pulls out is the 1992 Whitney Houston recording of 'I Will Always Love You' from 'The Bodyguard' soundtrack, a massive hit in Korea at the time. He asks Min-young to write the English lyrics from dictation — a playful, slightly old-fashioned romantic gesture — which then accidentally surfaces the mysterious handwritten inscription that sets off the episode's final crisis.
포카라 (Pokara) is a lakeside city in Nepal, famous among Koreans as a trekking base and romantic getaway near the Annapurna range. Korean travel to Nepal surged in the 1990s–2000s, making it a recognisable shorthand for an adventurous, intimate trip abroad. The specificity of the date and location — December 23 in Pokhara — is what makes Seo-jun's suspicion feel airtight to him.
Young Seon-woo is carving or writing words directly into the fabric of the house — a wall, a beam, or a floor — so that his adult self will find them twenty years later in the same building. This echoes a Korean folk instinct for hiding meaningful objects inside old homes; the drama turns it into a time-capsule plot device, and the audience just watched him choose this spot because he already knows his future address.
In Korea, a woman traditionally takes her husband's surname upon marriage, so 'turning Joo Min-young into Park Min-young' (주민영 → 박민영) literally means marrying her. Seon-woo's admission that this is what worries him — whether it was the right thing to engineer — reframes the entire romantic plot: he may have used time travel to steer Min-young toward a life she wouldn't have chosen on her own.