"Shuli left early for the villa (because O'hara told her that Jeremy doesn't want her to go to the wedding) so Rachel was tasked to get Shuli back before the wedding starts. Jeremy tried to delay the wedding as long as he could but unlike the manhwa, O'hara was already standing beside him in the altar. They waited long and when the nobles insist they start the wedding already the church doors burst open with a crying Rachel and behind her was 'Stripe' (Stripe is the Emperor's elite police force.) A stripe officer told Jeremy what happened to Shuli (her body was mutilated and her face barely recognizable) and Jeremy got so angry he strangled O'hara in front of everybody.
Now I'm not sure which stripe officer really stopped Jeremy from killing his wife-to-be on the altar but it was implied that it was probably Nora (because after O'hara's reputation went down the drain because she was almost killed by her groom in the altar, she approached Nora to try and have.....relations with him, because she said he saved her from Jeremy. But she's obviously just trying to save her noble title by getting engaged to the next best bachelor in the empire. But Nora was like, "Nah, bitch I did it for the Neuchwenstein kids, not for you.")
Nora is a Stripe officer directly under the Emperor which means he threw his 'heir' title from the Nurnberg Duchy. (He literally left the family. That's how bad the first timeline was!) And he's the one incharge of the investigation of Shuli's death."