Adopted daughter Su Rou has long acted weak to snatch opportunities from biological daughter Su Wan, with cakes, competition slots, and key class qualifications repeatedly conceded by Su Wan. During the key class selection, Su Wan no longer compromises, publicly piercing the disguise of Su Rou's false modesty, leading to endless turmoil ever since. Su Rou tampers with the competition application form and spreads rumors; her adoptive parents exert biased pressure, cutting off Su Wan's living expenses to force her to compromise. Su Wan works part-time to make a living on her own, wins the grand prize in recitation through sheer strength, and secures an independent enrollment opportunity at a prestigious school. By chance, two birth certificates uncover the truth: Su Rou is actually the wrongly swapped child.