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Moreover, if Nangong Ye was a person of Dazhou, and his grandfather was a first-rank minister, then it's possible that Nangong Ye would receive even better and more meticulous treatment there. Even if he couldn't be cured, Nangong Ye would have returned to his roots, with no regrets.
As for Nan Feng?
The Emperor merely felt sorrow, fearing that, given Dajin's gradually diminishing military strength, there would be no capacity to snatch Nan Feng back from Dashun. They would have to wait until Nangong Ye's illness was cured, and only then could they formulate a plan. He just hoped that Dashun wouldn't get any more leverage over him; otherwise, he would definitely use it to exchange for Nan Feng.
In the end, he would not exchange a city for Nan Feng like Dazhou would. Although he liked Nan Feng, Nan Feng was not his in any specific way; he had no reason to make such a great sacrifice.
The Emperor soon had someone draft a letter to Dazhou, agreeing to exchange Nangong Ye.
