Why does Mu Chenting like gentle words?

There is a key point in Mu's emotional transformation, that is, after learning the truth of that year, Mu began to have a deep love for Mu. Mu Chenting originally thought that his parents' death was caused by Yan Wen's father, so he adopted and prepared to retaliate against Yan Wen. But when he learned the truth, his feelings changed fundamentally and he began to have deep feelings for gentle words. This emotional change is the basis of Mu's love for gentle words.