After I Died, My Childhood Husband

An arranged marriage tied her to a child groom eight years younger. A sudden accident ends everything—until she opens her eyes in a new body. Determined to erase the past and start over, she keeps her distance... until a chance encounter with the former husband, now a grown man acting strangely.

"I never forgot you. Not for a single moment." Ten years on, he still hasn't let go. And the now-older ex warns, "Don't forget that I'm watching you."

Her fresh start is suddenly under suspicion.

(Source: Kakao Entertainment, translated)