Thorns of Silence: The Seven Dragon Brothers' Regret

Seven Eldorian princes are cursed to turn into dragons at sunset. To save them, Princess Elisa secretly weaves magic armor, offering her life as a ultimate sacrifice. Manipulated by their deceitful adopted sister Bella, the princes mistrust and torture Elisa instead. On her 18th birthday, she dies to break the curse. Discovering their savior was the very sister they broke, the princes are forever consumed by unbearable grief and remorse.