Last 2 pages of 437: http://tieba.baidu.com/p/3854755725 Probably happened after the execution
Translation of the spoilers credits to DarkLordOfKichiku:
First of those two last pages:
Sei: You have lost everything, but…
Sei: Either way…
Sei: Your journey is over.
Sei: The journey that was a path of thorns you walked barefooted… Is finally…
Sei: Your two children were secretly brought out of the palace/city.
Sei: As long as it isn’t detected, their lives will soon be out of danger’s reach. Only a few knows about it.
Sei: I do now know how many years it will be, but when all of China has been conquered
Sei: Those two will be sent for, that’s for certain.
Sei: So please…
Sei: (the resolution of the picture prevents me from seeing which kanji in the next last picture is, and the very last speechbubble is too blurry)