Lin Yi, a doctor of history, traveled through the late Southern Song Dynasty and became a staff member of Lu Xiufu's tent. He was familiar with the outcome of Yashan. He advised the troops to withdraw from Qiongzhou to the south three times, but was dismissed for "shaking the morale of the army" and eventually died under the sword of the Yuan army.
When he opened his eyes again, he was standing on the road to the underworld. In front of him are the loyal souls of Yashan who jumped into the sea and died for their country. They are Lu Xiufu who carries the young emperor on his back. They are the emperors and ministers of the last days who are full of regret.
And in his mind, the [Underworld Nation-building System] was activated.
"History cannot be changed in the underworld? Then let's start over in the underworld!"
He persuaded Lu Xiufu and met with King Yama, which shocked Wangxiangtai. When Taizu Zhao Kuangyin's chariot tore through the sky of the underworld, when Yue Fei led one hundred thousand loyal Yin soldiers to kneel on one knee, when famous ministers such as Bao Zheng, Wang Anshi, and Su Shi gathered together - Lin Yi knew that their war had just begun.
Rebuilding the Song Dynasty in the underworld, with one hundred thousand loyal souls as the foundation and Chinese civilization as the banner. Judge Qin Hui, liquidate Zhao Gou, confront Genghis Khan's Yin soldiers, and open up Yin and Yang to entrust Zhu Yuanzhang... What they have to do is not only to establish a dynasty in the underworld, but also to hold on to the fire of civilization and wait for the day when the mountains and rivers in the underworld will shine again.
"This time, I will not be driven away again." Lin Yi stood in front of the Yama Palace and swore to the 100,000 Song souls, "I will assist Prime Minister Lu to build a Yin Song in this netherworld that is more powerful than the Great Song Dynasty!"