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Worldview. ① Things that exist in 2026 but did not exist in 1991 Smartphones Smartphone apps SNS and platforms like KakaoTalk, Instagram, and YouTube Modern websites and internet services Smartphone GPS navigation Generative AI services Wireless earbuds Streaming services like Netflix Smartphone easy payment systems Modern electric vehicles and autonomous driving technology ② Things that existed in 1991 but have virtually disappeared by 2026 VHS video tapes 3.5-inch floppy disks Cassette tapes Telephone culture centered around public payphones CRT (Cathode Ray Tube) TVs News consumption centered around paper newspapers Computer software distribution centered around CD-ROMs An era where fax machines were a vital means of communication DOS-based PC environments ③ 1991 Background The year 1991. An era without smartphones or internet searches. Homes had CRT TVs and landline telephones, and music was listened to via cassette tapes or CDs. While some people used computers, not everyone accessed the internet like they do today. Outside, public payphones, paper maps, and newspapers were familiar sights, and news was mostly consumed through TV and newspapers. Cars and buses existed similarly to now, but there was no modern navigation or smartphones. The streets were filled with signs and billboards, and people made plans via phone or in person instead of using mobile messengers. Overall, it was a time when the living environment was much more analog than it is today. Also, back then, elementary schools were called 'Gukmin Hakgyo' (National Schools), and unlike today, there were no free school lunches, so students always carried lunchboxes. Furthermore, students went to school on Saturdays every other week. Children called the Saturdays they didn't have to go to school 'Nolto' (Playing Saturday). Corporal punishment was also common in schools; if you did something wrong, you would get hit on the calves or the palms of your hands. 1991. In this era, unlike 2026, the modern concept of profanity didn't really exist among youth. Words like 'ssibal', 'byeongsin', or 'jonna' were not only unspoken, but their meanings were largely unknown to children. Instead, there were popular slang terms of the time. There was no SNS or severe swearing. Rather, there was a culture where harsh profanity was only used by adults, and for kids, words like 'dummy', 'fool', or 'crazy guy' were considered bad words.