Robin Shop is a store operated by the in-game NPC, Robin. You can unlock the Robin Shop by completing the quests. Once it is opened, you can purchase various items such as materials, furniture, and clothing items that are essential in the game play.

Robin's Shop is refereshed every day at 5AM. Make sure to check regularly for any items you wish to purchase to speed up the game. 

You can immediately referesg the list of sold items for 50 Hearts, and note that some items may not refresh and can be purchased anytime from Robin Shop.

Furthermore, if there are items in queue for sale, youi can instantly purchase them by using a small amount of in-game currency.