Wontons are a classic Chinese dumpling variation: instead of like their semi-circle cousins, wontons are made from a square wrapper and usually have less filling (but of course, this just means you can eat more of them in one sitting). They're literally a soul-warming meal, especially if you eat them alongside the hot soup, with a generous dollop of spicy chili crisps and green onions.
In Chinese, 盒子 (hézi) literally translates into box -- an edible box, of course. A typical “box” that you’ll see sold as a quick street food item consists of chopped chives and eggs (or some other variation of that) stuffed into a dough “box,” although that box is shaped more like a crescent moon. I like to think of them as the older cousin of dumplings. Both are like savory pocket pies, but hézi usually are larger, have more filling, and a crisper skin.