Become an Adult by Taking the Imperial Examination and Entering the Court

Imperial Examination Number One Scholar

I want to read a book similar to "Imperial Examination, They All Say I'm a Wenquxing Who Came to Earth". The protagonist takes the imperial examination and becomes a young prime minister (around 20 years old). He and the young emperor are mutual confidants and cherish each other. It is an imaginary historical novel. It is unsystematic and relaxing.