Kanshou Taishou kara Kokuhaku Saremashita.

Our protagonist is an overeager, idol-loving girl who was reborn as the daughter of a noble family. As an aristocrat, she attended all sorts balls and other events, but she was more interested in watching the handsome men than socializing, dancing, or looking for a marriage partner. Of course, she was just admiring them like she did when she was watching idols in her previous life, and she had no intention of getting involved with the handsome men she admired. But one day, her favorite "object of admiration," the son of a marquis, asked her to play the role of a lover for the sake of convenience. "Uh, you're too close! This is not good for my heart.....!" She could have just watched from afar. Now she's going to get an eyeful up close! (Source: Frontier Works, translated)