My Happy Marriage - Manhwa

Despite being from a family with a legacy of extraordinary powers, Saimori Miyo did not inherit any of them. She was also humiliated by her half-sister, who unexpectedly awakened her own abilities. Neglected by her family and rejected by society, Miyo was a forgotten daughter. Even her childhood friend, her sole ally, married her half-sister in order to control the estate. Miyo is then sent to the Kudou family, rumored to have a heart of ice and no mercy.

This is the physical copy of the My Happy Marriage manhwa.