What's behind grandpa's door?

[Sim de Lune]

There's this door in the living room and Emily keeps saying "Maybe he'll show me what's behind it when he trusts me enough" or something. Is this actually a goal you can reach? I finished the game and all of grandpa's quests, but she always said the same.

[vigokrell]

Same question.

[[Элдан] Seragantos]

DLC