Who Doesn't Want the Senior Sister I Picked Up?

Many years later, Shi Xinren will think of that afternoon when he rented a house. Why is there suddenly an additional senior living with me? But the senior sister is quite good at taking care of others. Why did he later find out that his senior sister was quite cute? It was strange. Senior sister's perspective: What do you mean you only regard me as your sister? What does it mean to be happy spending time with you? What do you mean you have a mental illness?