The Real Heiress Is Back!
The female protagonist was swapped at birth by her enemies and abandoned in an orphanage, but she has a twin sister.
After starting work, by a twist of fate, she returned to the city where her biological parents live and was recognized by her siblings.
The family treats her very well, but the protagonist always feels uncomfortable. The family's attitude toward the original "fake heiress" hasn't changed much, and she can't integrate into the family.
Until the triplet brother's return abroad, which gave the protagonist a great sense of security, they finally put matters like "changing name, entering the family register, and holding a return banquet" on the agenda.
Afterward, the protagonist gradually changes. Besides the second brother, she meets someone who treats her very differently, unlocking all her heart knots, healing all her pains, and gaining love.