Cheap Sister

When he was twelve years old, the genius boy welcomed a reorganized family and gained a sixteen-year-old stepsister. However, just one year later, his father died unexpectedly, and the family business went bankrupt due to infighting among the top management, leaving the thirteen-year-old to depend on his stepmother and stepsister. At the desolate funeral, his stepmother resisted the cold eyes of relatives and friends and gave him a home. And the salty step-sister who originally just wanted to "hold her thighs and lie flat" quietly upgraded her plan after seeing her brother's amazing IQ——