morally grey meaning

Zendra Allyssa Enriquez was forced by her family to embark on a deadly mission driven by a single vision: Revenge. To achieve this, she must marry Kai Rowan Grey, a ruthless half-Filipino-American billionaire, by any means. However, Kai's offer comes with a condition - a Contract Marriage that requires Zendra to pretend to be his wife in front of others and his family. Seizing this once-in-a-lifetime opportunity to infiltrate the enemy's lair, Zendra agrees to sign the contract. But she never expected to become tied to the enemy's heart! Will she obey her family's orders or follow her heart?