"Why does mother always wants to be killed by the protagonist?"
This question has been pondered countless times by Liyu. She has discussed it with her brothers, sisters, and Xiao numerous times.
If her mother dislikes certain things, they would not hesitate to destroy them, even if it meant destroying a country or a race.
They wouldn't care about the surrounding environment either, as they would "kindly" ask their elven friends to help modify the conditions in the Winter Forest.
If they felt that living as a building was too boring, they would go to great lengths to make their mother happy...
In short,
If they could just understand why their mother wanted to be killed, they might be able to find a solution.
However,
