Holy Emperor Li Changsheng has strategic plans for the Great World and ideas for Dusk, and the plan to cooperate with the Boundary Breaker is not an all-or-nothing gamble, but a calculated exchange.
If they succeed, the Unified Imperial Dynasty can secure a foundation for eternity; if they fail, Li Changsheng has additional contingency plans.
All of this is based on an adequate understanding of Dusk.
Dusk will arrange for a Proxy Agent to come when the world encounters problems, and the Proxy Agent is part of Li Changsheng's contingency plan.
If the Proxy Agent cannot resolve the world's issues, then they must "pay with their life," so the Proxy Agent coming here will undoubtedly make every effort to resolve the core of the problems.
However, the problem's core is the dynasty's eternal foundation; solving it would mean years of planning by the Unified Imperial Dynasty would go up in smoke.
