"You know how much the triplets cling to Qiao Nan. If they don't see Qiao Nan before sleeping and start to cry, I can't coax them."
Being clingy to their biological mother and wanting her to coax them personally when they were sleeping was a problem that any other child had. The Zhai family's triplets had this same problem as well.
Because of the triplets' habits, Miao Jing could only compromise. Who asked her to not bear the three children crying?
"Alright, I understand. I still remember what I promised. I was just saying."
She only said these capricious words upon thinking that she wouldn't be able to see the children when they were away and would feel as uncomfortable as having a piece of flesh cut off. If they really allowed her to do so, she wouldn't be willing.
Upon hearing Miao Jing's obvious guilty conscience, Zhai Yaohui didn't expose her, lest she felt embarrassed and became angry. By then, he would have to coax her.