I recently learned that there is one wallet in the world with 1 million BTC attached. Who do you think it could be?
You need to get your facts straight, you are a newbie so we get it but it is important to look for this information by yourself, it is believed by some that satoshi does in fact posses 1 million bitcoins making him by far the biggest holder in the world.
However we know that there is not a single address with that huge amount as he used a new address for each transaction in order to retain some level of pseudonymity, so we have no way to know how many wallets he had and how much bitcoin is on each wallet, as of his identity that has been a mystery since he made bitcoin and most likely it is going to be one of the great mysteries of this century.