I'm Calling in Zhenguan

My name is Zhang Daan, I have two brothers named Zhang Xiangxiang and Zhang Dashu, and I have a father named Zhang Gongjin, who should be hanging in Lingyan Pavilion now. None of the above is important. What's important is that I traveled through time and was still about to starve to death, but I didn't panic because I had a system that could exchange supplies. See how I turn clouds and rain, the handsome young man cannot smile...