I bought it because the back is pretty and I am satisfied. Hello, customer. This is GVG STORE. Thank you for your valuable review. :) It's a collaboration product, but you looked into it with amazing insight and purchased it! We are happy that your satisfaction has been conveyed to us! Thank you! :) I hope you wear it nicely for a long time. We ask for your continued interest and support in the future for our GVG STORE. Be careful of catching a cold these days with extreme daily temperature fluctuations! Thank you. :)