Check your Netflix, the air date will show in the episode count. It varies by region to region.
Strange. My sister sees 6 episodes. Try clicking on netflix from the NF button on this page-above and see if it opens the drama. Or change the settings to your netflix to English and search again. Hope it helps.
is this drama better or comparable to TTEOTM or BFTB?
I do not get why given a 1 and then come back to check. Let's say you did not liked the plot or actors but CGI is the best of this year. So having nothing to appreciate in 4 ep an give 1 is just mean hate as I see it. But Yes, drama is excellent. You need to watch at least 10 episodes to have an idea of it.