Du Eolgurui Hwangnyeo

Princess Apollonia may seem weak and dim-witted, but the truth is, she’s not as clueless as she seems. She must keep up her act of ignorance to foil her cruel father’s political schemes and weave her way out of his arranged marriages. Her ultimate objective is to avenge the deaths of her mother and grandfather and shape her own destiny! With a few secret powers, a handful of trustworthy allies, and some schemes of her own... will Princess Apollonia successfully reclaim her throne as the rightful heir?
(Source: Tapas)