What is คู่เรื่อง?

Yes—'duet' and 'duology' generally refer to the same thing: a two-book set. 'Duet' is more commonly used in romance marketing, while 'duology' is the broader publishing term.

It depends. Some duets are written to be read together for the full experience (with cliffhangers or complementary revelations), while others are structured so each book can stand alone but gains depth when read as a pair.

A duet focuses on one complete arc spread across two books, keeping storytelling tight and focused. Longer series expand the world and characters across three or more books, which is better for sprawling plots or many secondary character threads.

In apps like Endless Romance, duets can be implemented as two linked interactive arcs (for example, alternating perspectives or sequential chapters). This encourages replayability—players can play both sides, compare outcomes, and return for different choices—while allowing staggered releases to sustain engagement.