Saving this story idea. The hero will most likely be one of the five from "Heroes' Bones, Fragrant with Charm," but the two books' plots are basically unrelated.
After years on the throne, Li Yu, the boar-headed ruler, and the evil golden tabby Li Tan had ruled together as the emperor and the hidden power behind him, one in the open and one in the shadows. At last, the Tang Dynasty was once again enjoying peace and prosperity.
The transmigrated Hongyi Lords could finally retire with honor. To celebrate having turned the tide, they decided to invite the NPCs to join a team-building trip through the Tai Chi Palace dungeon in Xie Liulan's dream.
After beating the final boss and watching the cutscene, Jiang Zhaoyue and Fu Qianzhi secretly healed Li Tan as he traded blasts with Wang Maozhong. Suddenly, the earth shook. Zhaoyue's hand slipped, and she cast Yunsheng Jiehai by mistake. Its emerald domain enveloped everyone. When they opened their eyes again, they were surrounded by ruins. After asking around, they learned that they had arrived during the reign of Emperor Huizong of Song...
Li Chu/Li Tan: "My Tang Dynasty still fell? And where's the whole Tai Chi Palace?"
The Cangyun and Tiance generals: "We worked so hard to retake Hebei, and now it's lost again? And we lost more than just Hebei?"
The Hongyi Lords: "Well, forget the Sixteen Prefectures of Yanyun. A few years from now, the Jingkang Incident will be a real national disgrace."
One day, while scouting, Tang Lianxing witnessed a burly man punch a butcher known as Zhen Guanxi to death with three blows. When he returned and told the others, they finally understood: this wasn't the historical Northern Song. Zhaoyue, what happened? Yunsheng didn't take us to the underworld. It took us into Water Margin!
Years later, sitting in the Juyi Hall at Liangshan Marsh with the Northern Song court's decree of amnesty before them, the Hongyi Lords and NPCs asked, "Uh... how did things end up like this?"
Theme: In the gray chaos of a troubled age, there must be a body like a rainbow beneath these robes.