Help!!!! Read Earth Brush

Today I went to the Mall Bangkapi because there is the on-sale promotion until tomorrow. Red Earth, Bloom, THe Face Shop, and Etude are on sale up to 40%. I wanted to buy a portable lip brush, so I bought one from Red Earth.

Anyway, there is a problem. The BA told me that the one I bought is the lib brush, and I paid it for 405 out of 450, which is a 10% discount. However, its plastic case says that it's the concealor brush, not lip brush.

Should I go back and exchange it or it could be used as a lib brush ka?

I feel like I was fooled by that BA....

I have a picture from the red earth website, but the language is Korean.

I have never used Red Earth before, so if anyone knows about this brush, please help me na ka

Thanks ka