Hai Yin's qualification is definitely better, but Hai Yin is mainly engaged in the wholesale of musical instruments, and I feel that teaching is a bit negligent. I recommend Huayin Musical Instrument Store, which is a chain musical instrument store under Shanghai Huayin International Music Culture Development Co., Ltd. Because it is a foreign company, it pays more attention to the quality of teaching. In recent years, many colleagues have been introduced to take their children to learn piano. But their chain stores are basically in Pudong. There seems to be one in Xuhui. You can check Baidu's Huayin International official website.