As a drooling fanboy of the Japanese version (and still am), I watched this while expecting it to fail. I was wrong. Here are my pros and cons:
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PROS

STORY. The story is, of course, wonderful, which is what made me such a fan of the Japanese version. But, in some ways, the Thai version was better. For one (and this is a BIG one), the MC actually kissed, and several times! That was SO much needed in the Japanese version, as opposed to two wonderful actors who made it seem clear that "we're not actually gay, okay?" Blecch.

ROCK/WHAT'S HER NAME. Sorry, I've already forgotten her name. I realize that the female counterpart in the JP version was asexual, and that's fine. But I appreciated the straight couple here. They were adorable.

EXTRA INFO. I liked that Achi/Karan had real interactions with both of the families, which was missing in the Japanese version.

TAY. He really brought it. I appreciated how he made Karan/Kurosawa an even more deep character than what was shown in the JP version. He even cried.

CONS

ACHI. New did a respectable job here. But I missed the comical Adachi from the Japanese version.

LACK OF COMEDY. More lighthearted moments, please.

After the HUGE success of the Japanese version, this could have been a complete fail. It was not. And, in many ways, it improved on the earlier version. Kudos to Cherry Magic Thailand!

10/10 for me.