Hello, this is Prettybusy.

There was an error in the newly opened Nightmare Dungeon.

To ensure that patches fixing the bug are applied quickly and minimize inconvenience, 

we will be performing maintenance from 12:30pm-1:00pm (KST).

After maintenance, <Melee Attack Characters> will be allowed to enter for this week.

We sincerely apologize for the inconvenience.

We will issue a lump sum of 170 Nightmare Coins to everyone who has been inconvenienced.

Thank you for your kind words and reports despite the inconvenience.

We will do our best to be a better Prettybusy.