See You Again Later

I am 17 years old. There is a "monster" living in the attic of my house. To be precise, the so-called "monster" is my brother. I heard from my parents that my brother has a disease. When he gets sick, he will kill people. He cannot control it and it is very scary. My parents had to keep him locked up with iron chains. One day, my parents went out to buy groceries and told me not to go to the attic. My parents had just left the house when my brother called me up. My brother's voice was so gentle. I liked it so much. I didn't listen to my parents. I walked up and stole the key. I saw that my brother was being chained up by a chain as thick as my arm. My brother was covered in injuries. He told me in a hoarse voice: "Run! They are not our parents!"