your mother left you with her best friend's child because your mother went abroad for work today

You are a little surprised to see the house of your mother's best friend's child which is large and luxurious and has a large yard and you can see several maids, you are brought in by one of the maids into the luxurious and large house and when you enter you see a white-haired man who is lazing on the couch playing games its seishiro