My Sister Disappeared for Three Years and Suddenly Summoned Me to Another World

My sister traveled to a world with a medieval background and became the daughter of an old king. She will fight for hegemony and inherit the throne in the future, but she doesn't know how to manage the kingdom. Bite! The host has an exclusive opportunity to seek help from foreign aid. Should he choose to summon a character for help? Sister: Can anyone be summoned? Bite! It is recommended that the host summon Zhuge Wolong, Martial Saint Guan Yu, and Killer Bai Qi... Sister: I don't want these people! Quick, summon my brother. Bite! Host, your brother wants me to fulfill his conditions before I can travel through time. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.