Lydia, the Marquis's daughter, was enjoying fulfilling days after becoming engaged to Rogelio, the Marquis's son.

One day, about three months after her much-desired engagement, Lydia heard a rumor that Rogelio was "romantically involved" with a certain young lady who had come to the capital seeking opportunities. This rumor, it was said, was rapidly spreading among the nobility.

Although Lydia didn't believe the rumor, one day, witnessing an exchange between the two rumored individuals, she realized the reason behind it.

Having realized the cause of the rumor, Lydia sent a letter seeking advice to a certain person. That person was Crown Prince Ernest, Lydia and Rogelio's childhood friend and pen pal, who was currently studying abroad in a neighboring country for international exchange.

Then, a few days after sending the letter, news suddenly arrived that Ernest had completed his studies abroad and was returning home permanently for the first time in five years. It seemed that Lydia's presence and the aforementioned rumor were deeply involved in Ernest's reason for returning…

Due to Ernest's return and the aforementioned rumor, Lydia's engagement was about to undergo a dramatic change.

What kind of ending awaits this romantic quadrangle?!

＊This work has also been posted on Tsugikuru.