Princess Hours (Goong)

Due to a promise between the former king of Korea and an ordinary, strong-willed girl's grandfather, our heroine finds herself betrothed to a seemingly cold-hearted prince of Korea. How can she marry a guy who she overheard him proposing to another girl! Both unwilling parties agree to the marriage, each with his and her own different motivations for the agreement to marry. Can love bloom under the strain of love rivals and political ambitions?