What I like:
production quality
costumes
music
most acting

What I dislike:
The ending; yes it's fantasy and so on, but it's not believable.
Jom - he is sometimes docile, sometimes mature. Only in the finale after "returning" he is much more believable.
Stereotype evil Robert, he is too plain, just a 08/15 bad character from one of the cheap novels published every week, no depth, no other side of him, just 10 pages worth of the 60 pages.
Story-Plotholes: While Yai falling in love was shown for a long time, Jom just did it out of the blue, overcoming his trauma from ep 1 in a blink of an eye. To be gay in early 20th century was by far not as easy as it's depicted in this story. Yai confesses he loves Jom and the father was relativly mild., compared to other series where the family explodes even today. There were always exceptions to the rule but it makes this point of the story not believable.
Pacing: After Robert is removed from the series everything is dragged on an on which made me skip some scenes.
Yai with silly Mustache

Summary:
While the production quality was top notch, music was very fitting, the acting overall very good, the setting something unique, the ending unbelievable and the preview of a second season unnecessary, this show is a mixed bag. Jom should have been more struggeling and maybe slowly falling in love in episode 7 with the first spicy scene in episode 8. But of course they could have paced the show faster with some serene scenes inbetween. If there is a second season I hope they will not repeat the same mistakes they did this time where script and direction was sometimes weak.