My Wife, the Assassin

Annabelle Carr and Kian Lockwood marry, but Kian's brother, Hayden Lockwood, orchestrates a car accident. She develops amnesia. She escapes, becoming an assassin intending to assassinate Kian. Kian hides their past, keeps her by his side, and plays along as they develop feelings. Hayden schemes again, causing her to regain memory, then lose it again, adopting a new identity. Kian refuses to back down, determined to stay by her side, loving her through it all.