Finally back after 13.5days.
Arrived on 17 Oct morning and left on 30 Oct.
Couldn't really sleep well on the night flight there, and the inflight food from KL was bad, to put it mildly. The inflight food from Incheon was miles ahead of the KL one.
I managed to get good weather for my entire trip. The focus of the trip was on nature sightseeing and food.
4 nights Seoul (one day on G-Train), then the K-Shuttle tour for 3d2n along the west coast ending in Busan.
4 nights in Busan with travelling to Ulsan, Gyeongju, Geoje and Tongyeong, then back to Seoul for another 3 nights.
I originally wanted to get on the O and V Trains but had to change to the G-Train which was the only one available. The train started at 08:27 and we arrived back in Seoul at around 7pm.
The train ends in Iksan city but we decided to get off at Gunsan city, one stop before. Turned out to be a good choice.
Had some really nice local-only specialty Tteokgalbi and managed to get some pastries at Korea's oldest bakery, Lee Sung Dang, which has been in operation since 1945.
Visited the local museum and took a taxi trip to the Saemangeum Seawall, which is currently the longest dyke in the world. No foreigners apart from us

The K-Shuttle West Coast tour (KS201) was quite worth it (USD399/pax) as it took us to cover quite a few of the inner west coast cities showcasing UNESCO and cultural/historical sites. The focus of the tour was more on seeing the rest of Korea instead of the usual shopping and major touristy areas.
We got to stay in 2 nice hotels (Holiday Inn and The Ocean Resort) and understand a bit more of Korean culture and history from the tour guide.
We ended up in Busan and booked a daytrip taxi to Ulsan and Gyeongje.
We visited the Bangudae Petroglyph site and the guide took us to a famous kimbap restaurant featured on Korean TV.
After that we went to Daewangam beach which had fantastic views of the sea and coastal outcrops.
We also spent 1 day going to Geoje + Oedo Botania, and the Tongyeong Hallyuseudo cable car.
Back in Seoul we went to Petite France and Nami island. The fall colors were in full force there and it was so beautiful.
Sanmotoonge cafe was also a very good experience with breathtaking views from the northern part of Seoul.
An incredible trip with many fond memories.
As for my "to eat" bucket list, I managed to do most of it:
1. hoe of various fishes - Jagalchi, Noryangjin and a sushi joint in Seoul.
2. yukhoe - part of dinner package in Seokparang + a dinner in Jeonju
3. samgyetang - Seoul random place in Myeongdong
4. jokbal - Seoul Jokbal street
5. gopchang and its relatives - Busan
6. seafood jeon - Nami
7. sannakji and related raw seafood (abalone etc) - Noryangjin
9. various meat type soups (maeuntang + beef and pork) - seollontang seems good - had seollontang only
10. soy sauce crab - missed this
11. various galbi - Tteokgalbi was fantastic in Gunsan
12. various guksu, plus perhaps sujebi - great Sujebi at a place just beside Gwangjang market
13. various dubu hotpots - missed this