It is undeniable that lately the price of crypto currencies has dropped dramatically and even many have become worthless. I analyze this situation influenced by the price of bitcoin as the king of crypto currencies. As a king of crypto currencies, bitcoin holds great control over the price of other crypto currencies. If the price of bitcoin decreases then surely the price of other crypto currencies also decreases, but if the price of bitcoin starts to improve then the price of other crypto currencies also follows the rise. This is the role of bitcoin which is still very potential because most of the public trust is attached to bitcoin.