The Beloved New Daughter-In-Law Of The Wolf Mansion summary:

The sole heir of the notoriously frail Wolf family, Arsen, has died. The culprits were his father and half-sibling.They killed the heir with a lie, promising to use the family's healing abilities.As a result, the family was destroyed, and I was also caught up in it and died.But then..."My lady, wake up!"When I opened my eyes, I had returned to being seven years old, before my death!"Please let me marry Arsen!"I can't die unfairly again. I secretly requested a contract marriage with the Wolf family behind my father's back.