Black Market Foyd
As of the 12th update, 'Black Market Merchant NPC (hereinafter referred to as Dark Merchant)' has been added to 'Moonlight Sculptor'. Occasionally, there is a brief description that appears only at night.
The black market is only open at night (game time). Night comes every 4 hours in real-time, and in terms of game time, it means from 9 PM to 3 AM. If you convert this to real-time, it will appear in 8:30 ~ 9:30, 12:30 ~ 1:30, and 4:30 ~ 5:30 in the morning and afternoon.
If you don't miss all the time, you can use up to 6 black markets. If you approach the place during the day during game time, the dark merchant disappears, leaving a comment in the local chat that 'it's not a good time to trade'. Even if it's a hassle, let's wait for the nighttime.