Problematic Little Sister Fell In Love With Me

My old man pointed to the flower-like woman and said, "Call her mother from now on." He then pointed to a flower-bud-like girl and said, "This is your little sister."

My sister is not cute.

She is arrogant, taciturn, and weird, but she knows how to please our parents.

She is two-faced and deceitful, but it seems like she only treats me that way.

I care for her, try to please her as much as I could, but she still dislikes me.

Until one day, I found out her secret, our relationship begins to get a little bit weird...