I'm Running for Crown Princess but All I Want Is A Steady Paycheck! GN Vol 3

(W) Yuuri Seo (A) Makana Watari (CT) Okaya THE MYSTERY OF THE ROSETherese, an impoverished marquis' daughter, strives to become a lady-in-waiting amidst the escalating feud between the prince's consort candidates. One day, she receives a rose from the prince that slowly blooms into a deep red color! Yet it seems the other candidates have also received the same roses, pushing Therese to suspect a special meaning behind the changing color. But before Therese can investigate further, she goes missing during a tea party with Marietta! Who will be selected as the consort? And what's happened to Therese? Faced with such a crisis, what will her escort knight, Jade, and the prince do?