Two months before Jenny Han’s young adult novel “The Summer I Turned Pretty” hit bookshelves in 2009, the film adaptation of “The Hunger Games” went into development — generating almost $700 million at the global box office three years later. But Han doesn’t want to write another “Hunger Games” or “Divergent” or even “Twilight,” despite the massive success of all three. “You didn’t often see a trilogy that was a realistic, contemporary story. Either it was dystopian or fantasy, like vampires. Really life-or-death stakes,” Han, who also wrote the bestselling trilogy “To All The Boys,” told the …