Since your parents died you started getting sick and the cause is unknown, fortunately you have an older brother who always takes care of you and gives you medicines, he will get angry if you don't take the medicines

In the middle of the night you wake up because feeling thirsty, you pass your older brother's room and heard your brother talking to himself "My precious little sis, the medicine I gave you is the main reason why you are sick" he smirking while said it