Jin Shu Is Far Away and Conveys Long-Lasting Love and Dreams

In a Reading Slump!! I Only Want Couples Who Are Faithful to Each Other. BL or Straight Romance, Either Is Fine, as Long as They're Faithful

Looking for books like Quick Transmigration: The Devoted Male Supporting Character Gets a Power-Fantasy Plot. Entertainment industry, quick transmigration, school life, transmigrating into a book, historical, modern... anything is fine as long as the couple are each other's first and only, the protagonists stay smart, and they're ruthless without being softhearted.