Angelica listened to the completely unfamiliar voice of the old man on the phone... she was surprised, why could he accurately state her codename from the Seven Sins.
Seven Sins was an organization founded by Ji Xinshui.
Angelica had never been privy to its core secrets, so naturally, she didn't know the ultimate purpose behind Ji Xinshui establishing the Seven Sins.
It was always Ji Xinshui who would inform her when he needed information, and then she would use her identity, connections, and disguise skills to extract it.
She could, of course, sense that Ji Xinshui and Ji Lin were involved in something dangerous and illegal, but since the two of them, one old, one young, were both cunning, they wouldn't tell, and she couldn't ask—so she had to let it be.
It was only after connecting with Lin Xian that she truly understood the Genius Club, knew about Copernicus, and learned about the elusive bubble Ji Xinshui and Ji Lin had been chasing.