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[Male and female protagonists 1v1, clean physically and mentally] The eldest son of the Gu family has been frail and sickly since childhood, but he has an extraordinary appearance and is very good at strategy. His Royal Highness, the Crown Prince of the Dayong Dynasty, has been a sinister and yandere prince since he was a child. He has an alluring appearance and is both civil and military. But since he became his companion, His Royal Highness has become even more yandere. While eating, His Royal Highness the Prince said lazily: Brother Jingyu, feed me. Everyone: Your Highness, do you have no skills? Gu Jingyu: OK Everyone... While practicing calligraphy, the prince looked at Gu Jingyu lazily: Brother Jingyu, my hand hurts, help me write. Everyone: Your Highness, who beat someone so hard just now? Gu Jingyu: OK Everyone:... During the spring hunting, His Royal Highness the Prince said delicately: Brother Jingyu, come here and help me hunt. My aim is not good and I cannot catch the prey. Everyone: Your Highness, who has always been the number one in spring hunting in previous years? Gu Jingyu smiled fondly: Okay Everyone: Your Highness, have you noticed that you are becoming more sickly? The sick and delicate kind! [The sick and weak number one scholar and the fake prince × the sick and spoiled third prince] I won't abandon the trap, so feel free to enter it.