The MC died in her previous life and found that she became a handsome young teen that has one adorable, pretty little sister and a dependable big brother. She became attached to her family and decided to live as Jiang Shuyu from then on. Later, she found out that the day she awoke was the day before the apocalypse happened and started to prepare for it. She will meet her future comrades and become that world's "Ice emperor".

I actually liked that the brother was at least a bit suspicious after hearing the whole living as an ordinary woman for 10 years in the dream stuff. The sister trusting MC fully isn't weird neither since he literally put his life at risk to ensure her safety and ordered her to close off the door no matter what despite him being on the other side with the abberants, but the brother was away at that time (he did hear about it, but it'd just different you know)

Its also interesting that minor side characters can die. Like Blackie who MC wanted to recruit had died just like that

The most interesting relationship dynamic for me though is definitely Thirteen and MC. It's not cute but...I find Thirteen intriguing. He had been an OP monster who had killed many humans in the world MC was in, and he had killed indiscriminately. Yet in this world, he had just escaped from the lab (yes he was an aberrant who got experimented on by humans) and he seems to have not only intelligence that exceeds other monsters but also some sense of empathy (him with Beibei tho, Idk whether I should find this cute and wholesome or scary), loyalty (with Asura) and integrity (once he makes a promise, he actually follows through with it even if it's disadvantageous) making it hard to truly hate him (even if he killed Blackie)