Kumamoto, Takeo Onsen, Kyushu Trains, Ferry

Mainly photos
Itiernary
Day 1 - 4 : Seoul 
Day 5 : Seoul - Busan - Fukuoka
Day 6 : Fukuoka - Beppu
Day 7 : Beppu - Kumamoto
Day 8 : Kumamoto - Takeo Onsen
Day 9 : Takeo Onsen - Fukuoka
Day 10 : Fukuoka
Day 11 : Fukuoka - Singapore
Busan to Fukuoka / Hakata Ferry
The New Camellia Ferry plies between Busan and Hakata, departing about 20:00 from Busan and arriving in Hakata the next morning at about 7:30am

It was challenging to book the ticket from a non-Engish website, and I realised that I did not book the single cabin after I boarded the ferry. Immediately, I approached the reception for an upgrade to a single cabin.  Fortunately, one was available. 
Day 1 (6) Arrival at Hakata Port

Breakfast and collection of JR pass

Yufuin no Mori
The morning train to Beppu
On board the train

Countryside view of river, fields and mountain. 

Passing by the waterfalls, and small towns. 

Beppu Station

Hanabeppu Hotel

Dinner

Day 2 (7) Kumamoto
Hotel breakfast 

The train to Kumamoto

Scenery along the way

Aso Station - excursion for Mount Aso
Kumamoto Station

Lunch and visit to the castle

View from the top
Cherry blossom

End of castle tour

Kumamon - The bear
Supermarket and the local food
Eateries and more food

Day 3 (8) - Misumi , A-train , Takeo Onsen
Misumi
I got to know Misumi Station when I was looking for train rides in Kyushu. 
The ride was scenic passing by the sea, and the various stations with blossoming cherry blossom. 
Misumi Station is a well maintained station located in Uki, Kumamoto. 
Misumi West Port - The Unesco site
The sea view
View from the top
supermart and lunch
A-train
A-train
Takeo Onsen
Takeo Onsen is a hot spring town in Saga Perfecture, and has a history of over 1300 years.
Station.
Tower Gate - Sakura-mon constructed in 1915 and a National Important Cultural Property

Public bath 
Takeo Shrine
The Great Campor Tree of Takeo - ~3000 years old and about 27 meters tall
Day 9 Takeo Onsen - Fukuoka
Takeo Onsen Station
The "Kamome" Shinkansen began service in 2022 connecting Takeo Onsen to Nagasaki. However, Limited express Relay Kamome for travellers between Fukuoka and Takeo Onsen.