http://www.mangago.zone/read-manga/the_villainess_reverses_the_hourglass/
If I'm not mistaken LMAOO
OMG it is thankyou, but did it also have a scene where the ml is at the tea party and sees the sisters and its like wait a minute who are you or am i mixing up mangas????
yes it is
Oh! Do you want me to go look for it? If so I could just give me a moment
omg i found its, it was chapter 30, thankyou so much for your help. its where i left off last and its been in my mind for ages
it's about a female mc who goes back in time so know the future (also gives tactical knowledge to her father) and she goes to a store and tells the merchant to sell his expensive auction ticket and the ml is there and grabs her wrist and slowly falls in love with her as they bump into each other more and send gifts to her house through a handsome man who asks the family and sister for more tactical knowledge (the father says it's her sister that gave the last info but it was the mc) but thinks it's her sister but at a tea party realises he has the wrong person and the mc and sister look very similar and the ml keep his identity under wraps.