Time: 14:35
Frequency: 100%
World name: Ragnarok
Character name: Eunji Song
NPC name: n/a
Monster name: n/a
Class/Level: Blm/50
Party or solo: Solo
In-game time: 9:30
Area and coordinates: Private Cottage - Mist/Mist (Private Chambers)
Steps:
1. Enter your FC Estate
2. Go to remodel interior setting
3. Enter private chamber without closing the remodel interior box
4. When in private chamber cancel
5. Private chamber walls, floor and lantern will change to the one from the FC Estate until you leave.

Can also be done the other way around

1. Enter private chamber
2. Go to remodel interior setting
3. Leave to the FC Estate without closing the remodel interior box
4. When in FC Estate cancel
5. FC EState walls, floor and lantern will change to the one from the FC Estate until you leave.