C354
If Lin An'an had left Ji Chengyan's side, then there was no longer a need for her to continue acting this part. After all, the purpose of her acting was to get her to leave Ji Chengyan.
Since she was willing to leave, there was no need for her to kill everyone. She had to force her to die.
"Miss Lin …" She couldn't be with us if she ran off or didn't act