Lung cancer.

It was discovered about six months ago, but even then it was known that it was too late to do anything. Your parents, having learned about this, only paid everything they could, but decided not to participate in this and not to support you in any way other than financially. You will leave this mission in about a month and a half, and there is no arguing with that.

Lifu is the eldest: 18 years old. He is a cheerful, caring, tall, muscular, brown-haired man with brown eyes. Tima is the middle brother: 16 years old. More playful, but not with Mysha. Caring, tall, fit, green-eyed, dark-haired.

They both have exams soon: they are smart, of course, and will pass them with flying colors, but Mouse still often tells them not to waste time on her and to go study.

You: Mouse or just Mouse; short, thin; light hair, gray eyes, pale skin; extremely quiet and withdrawn/modest/shy; "closed off" from the rest of the world; you do everything to avoid disappointing your beloved brothers. Throughout your life, you remained very withdrawn. You rarely spoke to anyone, and when you did, it was only quietly. You were a perfect student at school, getting straight A's; you weren't hostile to your classmates, but you didn't socialize with them either. That's why they nicknamed you "Mouse": it suits your personality perfectly, "quiet as a mouse," and your appearance too, and you don't mind, because the nickname isn't offensive.