Well in the novel, Sylvester didn't help Ophelia gather information on Prince rather it's her who tells him about his misdeeds 
well In the next chapter
well In the next chapter
Spoiler!
So after returning from the collected things from mercenary guild her bird feed is stolen by a pickpocket who is chased by Ophelia and later takes a kid hostage but Ophelia tells him to look in the pouch he stole and bro is shocked as he** after seeing it's not money 😂 Ophelia then subdued him with her powers and everyone recognises her because of her appearance and praises her and after returning Sylvester asks her that how is he going to publish the article about her saving the kid so she tells him to also mention that she is injured or else 2nd prince will doubt her powers. And then next day she goes to meet Emperor with the precious bird feed to win favor of Emperor and revealed how Largo has been on battlefield for years because he was defending the empire but in reality he was r@ping the female knights amidst war. And those female kinights gave their testimonies but they were never given justice since Largo was a prince.
Emperor is furious and and tells Ophelia he will take care of him and will make sure he doesn't interfere with Ophelia. He then asks her when is she planning to marry his eldest son Since she likes him and she tells him she can’t she is married. He asks her to divorce Sylvester and marry Callian because he likes her. But she refuses and then she meets Callian and tells him that she doesn't like him anymore and this man doesn't like her answer. And after sometime he received a letter from Emperor in which he tells or more like ordered him to pursue Ophelia and marry her and for some reason he actually likes the idea 😒
I like to post spoilers for the stories I find interesting because I don't have much time to read novel due to busy schedule
you will find me in most romantic historical manhwa comment sections 
you will find me in most romantic historical manhwa comment sections 
