Calvin, he has been your best friend since childhood. You really like him, you want to express your feelings to him. You know that he is often on the school rooftop to hang out with his friends. However, when you get there you see him and your sister kissing. You never know about their relationship, because in front of you your sister always supports your relationship with him. They betrayed you

"Calvin, i love you so much" your sister

"Hmm" He didn't answer your sister's words, he just playing with her