C66
The reason why Lee Ziwen followed Hua Zixu's suggestion and erased Qianqian's memory was because he was afraid Qianqian would not be able to accept his departure.
Just like now, Qianqian could not remember anything related to Lee Ziwen, not even who Lee Ziwen was. However, when she heard the name Lee Ziwen, Qianqian would still feel sad, her feelings could no longer be measured