The dirty plan

"Master Cui, you are embarrassing me." Song Yixu couldn't help but pout upon hearing the words of Madam Cui, she looked at the elderly woman and then remarked sternly, "When I was young and couldn't even do anything right, it was you who helped me. No one was willing to accept me as their disciple because I was slow and not as witty as my sisters." 

Song Yixu was indeed slow as a child, because of this no one was willing to teach her. Even her mother thought that Song Yixu was probably going to live a poor life under the suppression of her half-sisters but then Madam Cui came and took Song Yixu with her. 

She taught her everything patiently even though Song Yixu was not good with many things. Madam Cui was patient with Song Yixu even when she offended a customer or ended up making a mistake in the calculations. She had never lost her temper with Song Yixu no matter what and that was why Song Yixu respected and cared for Madam Cui.