Cosmo had never been slapped by Zoe before.

They said that when parents pass away, the elder sister becomes like a mother, but Zoe had always treated him as an equal. Even when Cosmo was just a few years old, Zoe would discuss anything related to him before making a decision.

So when Zoe slapped him, her own hand froze, and her heart trembled violently. If it weren't for Cosmo going too far today, she would never have slapped him, especially now that he was fifteen years old. She didn't think she had the right to do so.

Cosmo let out a cold laugh. "If you want to hit me,...