Mu Cidian bought some raw food to bring home.
Before returning home, he specifically instructed his mother to go downstairs and buy him a bottle of special soy sauce, claiming he would cook soy-flavored duck for her that night.
Only after making sure his mother had left did he go inside, stripping off his dirty clothes, quickly cleaning the stains on his body, and changing into another clean outfit. By the time he emerged, his mother had already returned.
She didn't notice anything unusual about Mu Cidian and watched as he went into the kitchen.
As he walked into the kitchen, he was searching on his phone, presumably for cooking instructions.
Wan Quan was accompanying Mu Cidian, just that, without any intention of helping, watching as Mu Cidian made somewhat clumsy meal preparations.
Actually, Mu Cidian had never done this before.
He just felt that everything shouldn't be too difficult as long as you're willing to learn.