Ferrid's manga / #Cinderella?(1)

Cinderella but if the stepsister was misunderstood, smart, caring, and the MC. She eats a poisoned apple but no one questions who gave it to her and they dismissed it for a uncurable illness. At the ball, they meet many suitors in disguise Ch 9ish I get lowkey secondhand embarrassment watching all the scenes with the mc and ml. Why he so corny dumb