School Ghost Stories: The Midnight Classroom

Looking for a Novel Where the Protagonist Is in an Infinite-Flow Setting (Or Maybe Transmigrates?) and Has the Ability to Give Roses

Looking for a story with an Infinite Flow protagonist, or maybe someone who transmigrates. Their skill is collecting the bosses from different instances by giving them roses. The bosses are both men and women. The first is a vengeful female spirit in a school-themed instance.