Bikepacking across South Korea

(*useful info below*) I cycled from Seoul (Incheon) to Busan in 6 straight days, making approx 105km a day. This happened between 22-27 May 2022, shortly after South Korea reopened its borders to visitors.
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Where I rented the bike:
Green Bike Park. 19 Itaewon-ro 20-gil, 용산구 Yongsan-gu, Seoul, South Korea. It’s ok, but make sure you choose a comfortable bike suitable for elevation. They also transferred the bike from Busan back to Seoul.
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Where I bought the cycling passport and some accessories:
Bike Nara (Giant). 414-1 Hapjeong-dong, Mapo-gu, Seoul, South Korea
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Where I stayed:
Day 1: Dream Gungjeon Motel (1649-2 Gyeonggang-ro, Yangpyeong-eup, Yangpyeong-gun, Gyeonggi-do). 40,000KRW/night. An ok option.
Day 2: Rexy (or Lexy) Motel (5 Sangbang, 7-gil Chungju-si, Chungcheongbuk-do) 30,000KRW/night. Another ok option.
Day 3: Yes Motel (16-1 Seongdong-ri, Nakdong-myeon, Sangju-si, Gyeongsangbuk-do). 30,000KRW/night. The dirty one.
Day 4: CF Motel Seongseo Branch (90-12 Hosandong-ro, Dalseo-gu, Daegu). 45,000KRW/night. The nice one.
Day 5: M Motel (975-9 Namjijungang, 1-gil Namji-eup, Changnyeong-gun, Gyeongsangnam-do). 40,000KRW/night. Absolutely avoid.
Day 6: Gray Hotel (82 Bosu-daero, 124beon-gil, Jung-gu, Busan). 40,000KRW/night. Very good location.
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I used TRAILFORKS app to stay on the track.
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Stretches I did at the end of each day:
• Essential Post-Cycling...