I Transmigrated into a Harem Novel and Went on a CP-Breaking Spree

I'm determined to break up every couple in the overpowered hero's story!

The whole novel is being written in advance.

1. Both leads are each other's first and only, 1v1, sweet romance

2. No harem infighting, no women competing for men's favor, ensemble cast

Theme: Haven't thought of one yet