Traveling into Ancient Times with a Suitcase

Aliens bought the earth, and humans were forced to return to feudal society. The protagonist Yu Xiaoyu luckily traveled back to ancient times and began a wonderful life. How will the boy's experience of fast travel change the course of history? How could the vest and treasure in the box cause the Three Kingdoms War? Will the growing boy marry that cute baby again? Is it easy to be the son-in-law of the fake prince's family? The eldest wife, who has homosexual tendencies, has repeatedly snatched little fairies for him to be his concubine. How should he choose as the group's favorite? How many funny stories will the ignorant boy's little bit of modern knowledge lead to...? Boss, what is the alien conspiracy?