Why Is My Sister Acting a Little Strange?

[Urban Life] + [Older Sister and Younger Brother] + [A Slightly Unhinged Older Sister] + [A Sweet Older Woman-Younger Man Romance] + [No System, No Golden Finger] + [Not Reborn] + [The Older Sister Pretends to Be Yandere to Scare Her Younger Brother] ...That day, the rain outside was pouring... Gu Yuan thought his older sister had finally stopped being angry and was getting ready for bed when Song Chiyu suddenly shoved him down, straddled him, and pressed the back of a knife to his neck. Her face was bashful, but her eyes were full of madness... “Bringing another girl home, are you?” “No! She’s just my class monitor. She came by to drop something off...” “Big Sis, what are you going to do? Waaaah...” *Gu Yuan: I have an older sister who’s an aloof beauty to everyone else, and we’re not related by blood. Somewhere along the way, I developed feelings for my childhood friend. At first, I thought I was going crazy, but little by little, I realized my sister seemed to be acting strangely too. What’s going on? *Song Chiyu: I have a younger brother who isn’t related to me by blood... One day, I got drunk, and when I woke up, I found myself in the same bed as him. Nothing happened between us, but the feelings I’d kept hidden inside began to spiral out of control... I really want to... devour him… *Old Gu: I’m Gu Yuan and Song Chiyu’s dad. I think my son might be gay. What a disgrace to the family…