Of course grandpa would place his plans over MC, nobody doubt it. And nobody think Delun is good guy overall, no one Shangtian, Immortal or God is. But for now he looks like relatively good guy to MC.
Looks like MC mother escape was part of his plan to birth second Tang Wei, so I doubt that she would be sacrificed for LB.
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Why you making MC life with Rogues looks like slave life in cage? MC would have life with best resources Rogue have, family that not neglect him and most likely will love, people who see him as royalty, not a heir of pathetic and dying clan. Of course, they will not let MC leave islands, but one of biggest reasons for this is our safety. Because, you know, it's dangerous for Rogue prince in Empire. Restricted autonomy will not turn the MC into a slave, despite your believe. I am in Rogue path, but because this is most developed with best benefits. Believe or not, but I as unbiased for Rogues as possible, especially now when we know that LB don't care about POMA world and here only for Tang Wei