"A friend has prepared a wedding dress for the girl he loves, and he wants to give her a surprise. He didn't want to ask his beloved to try it on directly, so he called me... He just so happened to have seen you at a party before. He said you and the girl he loves have very similar figures, so he wanted to ask you to help try it on."
"I thought it was a small favor, so I agreed casually when he asked me... But thinking about it now, I might have been a bit hasty. After all, it's you who are being asked to help, and we should have gotten your agreement..." Speaking up to here, Han Jingnian deliberately added in a retreat-"If you don't want to go, it's okay. I will call him and tell him you're busy, that you refuse."
Just as Han Jingnian said, helping to try on a dress is indeed a small matter.