Do you know about Stone Grandpa (石头爷爷)? Well, he is very famous in South Korea! 这周，Ella就带你到韩国，去认识一下石头爷爷，尝尝美味泡菜。Taekwondo is a very famous sport in South Korea. Parents send their kids to learn taekwondo at five or six years old. They believe children will grow to be healthy and strong with taekwondo...