So Yong Kim partly based the story on her own experiences growing up in Los Angeles after emigrating from her native Busan, Korea when she was 12 years old.

Scott of The New York Times wrote, "In Between Days, the sensitive, modest, thrillingly self-assured first feature by So Yong Kim, was one of the standouts of the 2006 Sundance Film Festival -- exactly the kind of thoughtful, independent work one hopes to find there and too rarely does.

"[8] Scott commented "How [Aimie] deals with [her] disappointment, and her more general alienation, might have been turned into either a fable of self-esteem or a cautionary tale of youth at risk.

Instead, Ms. Kim uses rough, naturalistic cinematography and sound design to bring us into a state of remarkably intimate sympathy with her confused, inarticulate heroine.

"[6] Ed Gonzales of Slant called the film the most "intriguingly circumscribed romance of the year", commenting "The director's experiment in non-description can be frustrating (where are we?

"[12] Maitland McDonagh of TV Guide called the film "a small slice of a suspended life, intimate and filled with the mundane details most people forget when the waiting is over and their real lives begin.

"[13] Lisa Schwarzbaum of Entertainment Weekly gave the film an A grade and described it as "a quiet specimen of personal storytelling at its most exciting", noting Kim "captures feminine melancholy with rare precision.