"(Y/n)! Open the door!" Yuta and Taeyong yelled. My best friend and brother was banging on the door as I gripped the blade in my hand (Y/n) is taeyongs sister, she's younger than him by 2 years, Yuta is her best friend and he knows how she's depressed but he was too scared to tell Taeyong. Will Taeyong find out about (y/n)'s depression? Will Yuta save her?