Fantasy Longevity: From Hostage Prince to Supreme Invincible

After dying in an accident, a former Federation scientist became Zhao Chengyong, the Thirteenth Prince of the Great Li Dynasty. Drawing on the knowledge he gained while exploring ruins in his previous life, he secretly cultivated within the Great Li imperial palace and built up a following in secret. In the War of Li and Yin, Great Li suffered a crushing defeat, ceded territory, paid reparations, and sent Zhao Chengyong away as a hostage. Ten years later, thirteen princes of Great Li had died under mysterious circumstances. An envoy from Great Li arrived in Great Yin to bring Zhao Chengyong back to court. And so our story begins: from surviving an assassination attempt to returning home, establishing the Zhenwu Bureau, riding roughshod over the martial world, ruling Great Li, destroying Great Yin, and bringing peace to the world through martial power... P.S. There are female characters, but no female lead. This is not a mindless wish-fulfillment story. If you’re looking for a harem or pure wish fulfillment, please look elsewhere. Thank you!