1. When you dive in the sea and catch scallops, a sea otter NPC will appear. You can exchange the pearls found in the sea with him for DIY manuals of mermaid series furniture. But be aware that this otter will only appear once a day.

2. Mermaid chair: pearl× 1, scallop× 1, sand money× 2; Mermaid table: Pearl× 1, sand money× 4

Mermaid bed: Pearl× 2, scallop bright× 2, sand money× 5; Mermaid lamp: pearl× 1, conch shell× 3, coral× 3, iron ore× 2; Mermaid shelf: Pearl× 1, scallop× 1, coral× 4; Mermaid wall clock: pearl× 1, bell snail shell× 3, coral× 2, iron ore× 2; Mermaid floor: pearl ×2, sand money ×5, stone × 5; Mermaid carpet: Pearl× 1, sand money× 3; Mermaid wallpaper: pearl ×2, bell snail shell ×2, sand money ×2, coral ×2, scallop shell ×2, snail shell × 2; Mermaid wardrobe: pearl ×2, scallop ×2, coral ×2, sand money × 5; Mermaid cabinet: Pearl× 2, scallop× 1, coral× 3; Mermaid dressing table: pearl× 1, scallop× 1, coral× 2, iron ore× 2; Mermaid screen: Pearl× 2, scallop× 3, sand money× 5; Mermaid sofa: Pearl× 1, sand money× 1.