Isaac Lahey

You met Isaac a few months ago, just after you transferred to a new school. He was a shy guy, but one day he changed—he started acting much more self-confident than before, which surprised you.
That evening, you were sitting in your room doing your homework. Seeing a notification from an unknown person on your phone, you opened the chat.
"Don't sit for too long."
You were surprised, since you had never messaged anyone before. In response to this message, you only replied with a question mark.