Kakakaka

Two brothers with no official identity scrape by from day to day. But the elder brother dreams of rising through the ranks by passing the imperial exams. When he volunteers to take the exams in place of a powerful man’s son, he sets foot on a path that will change his fate... With nothing but a brush, overturn an age of power. 17th-century Ming China. The curtain rises on a tale of ambition, revenge, and the imperial examinations!

(Source: MANGA Plus)