Metropolis: My Step Sister Is a Bit Weird

My name is Su Ran. I have a happy family and an adopted sister. My sister is very beautiful and treats me very well. But gradually, I felt something was wrong with my sister. Not only would he come to my room secretly at night, but he would also sneak into my closet. And it became more and more excessive, and in the end she even broke into his room in front of him. This confused Su Ran. He didn't know what to do, but he knew that his sister was a little strange. Ps: This book takes a warm and heartwarming route and will most likely have a single female protagonist. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.