Let's just look at some of their achievements there:
-Just won BEST NEW ARTIST in the Japan Golden Disc Awards which is very prestige
-They own the highest selling album among 4th gen in there
-They have the longest charting song of 4th gen at #1
-They own the longest charting japanese song by kpop act at #1
-They own the second longest charting kpop song at #1
-Highest 4th gen entries on couple of Japanese billboard charts
Do tell me if I'm missing something. It's been only eight months since their japanese debut and look at them go. Very proud of them.
Ps. If someone has the tag list of engenes pls use it because I will never be able to discover how to do that