LIKES:
Aaron Yan listed as the Male Lead and for what he was given, didn't disappoint.
Cinematography was well done.
Music was perfectly crafted, especially the violin parts that hit your emotions (more than some of the acting).
My favourite parts from the whole thing was the old man Hayama and his interaction with the ML/FL and his whole storyline.
The traditional Taiwanese dancing in Episode 2 was beautiful to see.
Cinematography was good.

DISLIKES:
Production tried to link it all together, but you could tell there were parts cut out, it wasn't smooth. At least there were no shaky camera situations to add drama.
Unlike the train they were designing, the drama moved very slowly and some moments I fast forwarded (like a very slow moving moped out in the country scene), that and some really drawn out moments like at the beginning of Episode 2 [no traffic]. That’s the director’s fault and maybe the writer too. A lot of time wasted on the side stories, (like the hostess club bits) instead of focusing on the FL and ML. I really dislike women like the character for the FL; indecisive, not following their heart, being evasive or giving mixed signals, etc.
The train parts felt like a documentary, more than a drama, some parts were redundant. A good chunk of it was about how the train linked Japan and Taiwan together. The “romance” of the FL & ML was under utilized and seemed like a storyline thrown together. The storyline of Hayama seemed more like the main story, after the train.

OVERALL:
Most of it was almost boring, with some interesting bits. Not well planned out. I don't recommend this and won't rewatch.