"Ah?"
Enya stared at the Celestial Messenger, her eyes widening slightly.
This uncle looked like someone who'd been through it all.
The Celestial Messenger had stayed in the Astro-World for several centuries already, having encountered all sorts of characters. He had seen the vicissitudes of life and said reflectively,
"Ah, the youth."
"Could you elaborate?" asked Enya, her expression blank.
"Their relationship."
The Celestial Messenger's expression was inscrutable. He slightly bowed his head, maintaining a posture of great vicissitude. He gently stroked his beard, which seemed to be glued together by starlight,
"It's a connection of the heart, and what's more, that little girl owes An Su a debt of affection."
I want to understand him = connection of the heart.
I want to settle accounts with him = owes a debt of affection.