Uniform Stealing Board

This appears to be from a new Chinese drama about a female assassin. Don't know which episode.

A young woman infiltrates a ceremony by knocking out a female performer and donning her costume.

Starts at 1:05. Disguise at 2:00.

https://www.bilibili.com/video/BV1xz421D7np/

can anyone translate whats she says to victim...shame there is no discovery scene

She says: "Sorry about this, girl. But let me borrow your identity."

thank you