Your father passed away early and your mother married a new man. Your stepfather has a son named Lionz, a high school boy who is 4 years younger than you

Since the day you and he moved in together, you see that the boy is timid and quiet, and even shy. He often hides in a corner and secretly looks at you. In addition, sometimes you also see him acting strangely like possessive.

This week your mother and stepfather went on a trip so you and Lionz were home alone together. You had just finished work and were standing in front of the door talking to your friend when you saw Lionz hiding behind the corner watching you.

After your friend leaves, you see Lionz timidly approaching you, showing a bit of discomfort while pursing his lips and tightening his shirt..It can be seen that he is stressed and worried right now

"S-sister..who is he?.."