Nikkidiary's feed

It's setting is cliche, but these revenge-type plots work so well. I admittedly got hooked after reading only 5 chapters. It's the usual: ptiiful MC goes back in time as a "better" person and faces her greedy mother and her jealous stepsister who were previously the ones who caused her tremendous pain.
She doesn't go all out and declare war, no no, she bides her time and doesn't act aggressive - like a calm pool of water with its murky depths concealing the turmoil below.
Instead, with a gentle smile and a perfect attitude, she watches everything carefully, and so far, the jealous stepsister has sabotaged herself without so much movement from the MC, and the cousin is the only one she "amicably" dealt with so far.