As others have mentioned, Yuri is in fact the daughter of a honey-trap class spy that was sent to the royal capital as a maid to destabilize things, but fell in love with a baron and became pregnant. She was chased out by the barons wife and forced to live in the slums with her daughter Yuri. Some time passes and she's visited by her partner(can't recall the name) whom she dismisses. After passing away, the partner takes Yuri under his wing and trains her to be a honey-trap spy. This actually explains all of the capture targets perfectly,
Bern - Son of the Duke and Prime Minister whom is second only to the crown.
Van - Son of the Pope of the main worshipped religion in the country.
Dorssen - Son of the captain of the royal knights who protect the royal family.
Edward - Crown Prince and second in line for the throne.
Any one of these would give her tremendous power and influence and she managed to snag all of them, but there were some snags. We've already seen the ones with Bern getting chewed out by his family and realising now how insane and wasteful their ideas and proposals are. Dorssen was eaten alive and damn near disowned by his father for his behavior towards Iris since he acted and made denunciations without proof and his mom gives him a Reason You Suck Speech about how his actions destroyed Iris's life when she was justified in her actions at another woman chasing her man and cites her running the Azuta Conglomerate as her way of coping and readying for a life alone since she was ousted from society by them. When word gets out that Iris runs Azuta, Edward tries to create a rival company, but can't match them in the slightest due to their more advanced managerial tactics, resources, knowledge, and public perception so he has Van drum up some false charges to have the church excommunicate her causing a massive scandal that bites them(Iris and her company) HARD. This backfires BADLY on them though since with help from Dean, they're able to not only prove their innocence, but cause an even MORE massive scandal outing large amounts of corruption in the church with the Pope being at the top of it.