Quick Transmigration: Face-Slapping the Heroines, While the Male Leads Belong to the Supporting Men

This is a story about a male lead's love interest taking a System along to win over the male lead... It's also a story about a supporting male character working hard to rise to the top. The worlds include school, urban life, ancient times, interstellar settings, beastmen, and fantasy. That's the list for now. By the way, this is the author's first time writing, so readers, please feel free to share your thoughts about anything that could be improved. The author will keep working to get better. Hope you enjoy reading!