Literature Reference: Not just a casual bond, but a predestined connection from long ago. Source from 'Drunk and Re-gifting Huishu' by Bai Juyi.
宿: Celestial Mansions.
缘: The reason, the cause. It signifies generosity and propriety, conducive to forming widespread connections and encountering the support of noble benefactors.
Meaning: A predestined connection, symbolizing a deep and fated bond.