Summoning In the Snow, My Harem is Too Dangerous

Novel Summary
Xia Ji traveled to the continent of Kyushu and became the Emperor of Xia.
I thought I had no worries about food and clothing, and I could enjoy peace of mind.
But he never thought that he might be the last emperor.
The seven kings of the court were in chaos: Qin Wang Ying Zheng, Tang Wang Li Yuan, Ming Wang Zhu Di, Yuan Wang Genghis Khan, Han Wang Liu Che, Song Wang Zhao Ji, and Qing Wang Kangxi.
The harem is full of ruthless characters: Concubine Jiang Yuyan, Concubine Dongjun, Concubine Xuan, Concubine Yuan Zhao Min, Empress Wu? Live? br />This kind of hell start, is it possible to become the last emperor of Xia Dynasty ?
But luckily.
At the beginning of the game, Xia Ji awakened the National Games Summoning System.
Spring and Autumn Sword Armor! Great Confucian Sage of Chu! Soldier in white!
Flatten the harem, rule the world, and suppress the seven kings.
From then on, the great summer that will never end has been created! …
– Description from readMTL