I believe it is, yes. Off topic: it looks like that in that server you can do things when Chi Breathing pops up. Is that the KR version?
Yes this is the training dungeon. The NPC that teleports you into the dungeon has been removed but the dungeon is in-game.
yeah I noticed NPC is gone I have found more videos of this dungeon that is inded korean version because I've played all others like RUssian Taiwanese Vietnamese haven't seen the NPC
Basically you go in at level 20 and you can train until 168. Clinic, hermit, blacksmith and npc that sells items for coins from Blue boxes.
how you got all this info I play korean version and I dun even know these things o__________________o
Well the quest appears at level 20 and it pops-up again when you are in Hefei. As for anyone seeing it, the moment you make it to any RTD chapter 2 you will see the dungeon.