Yiren is cuning?

Wang Shan from the corner of the room was out of words when she saw what her mom was doing as this was her first time to witness her mom being angry over Yiren. Because inside the house they would always be as close as possible. Wang Shan thought 'did some brain cells start to work in her brain after getting hit by dad yesterday?' 

"Yiren started to humble herself as much as possible by showing it in actions and Wang Shan immediately knew that this was overacting just by seeing it from afar. She looked at her brother and felt like he was unbothered by the situation so Wang Shan continued to watch the drama that was happening before her and wondered what made her cousin to overact.