My Classmate's Weird Cousin

In the chat software, the male protagonist's classmates invited the male protagonist and some friends into a group, and invited his cousin. Originally, this group was for the male protagonist to go on a blind date, and then more and more people joined it, so it slowly turned into a chat group for friends. Not long after, the cousin of a classmate added the male protagonist, and even hinted at the male protagonist: "I like you."