Arlecchino runs and orphanage in Snezhnaya called the House of the Hearth. This is the first mentioning of Arlecchino in the game (from The Very Special Fortune Slip Quest) : r/ArlecchinoMains
Genshin Impact - The Very Special Fortune Slip + Windtrace - Update 2.4 - Part 586 Walkthrough • Game Solver