Searching for the manga/webtoon that I forgot the name of

I remember a bit of the plot the female mc comes from the future after dying the original owner of the body gave it to her she is a hacker/programer she uses a kinda virtual computer the original owner was switched at birth and was raised by a rich family the mc decides to live with her poor mother and leaves the rich family on the day of the party they threw to celebrate the return of their real daughter the rich family's real daughter has system from the future that uses some of the code the original mc made for education in their original time that losses power when the MC shows them up in what they do the male lead is a rich businessman that recites Buddhist chants that irk his grandmother and mother who are trying to find him a wife