Manhwa name! Please help

I remember a scene in this manhwa, a side female character became a widow, she had a son , he late husband left a will hidden in their favourite place or grave idk , since she didn’t find it , all of his wealth and title went to his other family member ( brother or another son) , the FL reincarnated and knew about this so she told that widow which guaranteed that they inherit everything and would never suffer like in previous life. Please help me find the name if u know. Thank you