This bike is almost identical to the Hensim 150 we used to have a few years ago in the US, and Haosen is related to Hensim, who make the very popular Hawk 250 and Viper 150 currently. Jerryhawk 250 had a good suggestion to contact ASPCUSA, or you can try Adam Renkleff who is a member here and works for the Hawk and the Viper's distributor, RPS. I know that RPS cannot sell whole bikes because they are a wholesaler, but might be able to sell body parts. Try him anyway if Don at ASPCUSA cannot help you.
www.therps.net