I just searched on Baidu and there is no such place on the map, I only found a news article mentioning Zhao Dongwan in Renhe town, see the screenshot. If this is the Zhao Dongwan in Renhe you are talking about, I hope what I said helps.
There is a long-distance bus from Zhengzhou Erma Road Coach Station directly to Ducheon, which is about 5 hours away.
After arriving at Ducheon, there are many buses to Shuangliu and Shangcheng coming out of Ducheon Bus Terminal, which all pass through Renhe, half an hour away.
At ? Renhe intersection?
After getting off the bus, there are many vans parked at the intersection, ask the driver how to go, or spend some money to send him there, or you can find someone to pick up.