Transmigrated Prince: This One's a Bit Weird

Modern security guard Yun Zheng finds a jade pendant that acts as a cheat code, accidentally transporting him to the Great Qian dynasty where he becomes the Sixth Prince Yun Zheng and inherits all his memories. He eventually wins the hearts of Shen Luoyan, Princess Jiayao, and Ye Zi, is forced to become the crown prince of both Beihuan and Great Qian, enjoys a carefree life, and finally lives without shame or restraint.