Ho-jeong (Moon So-ri) gave up a career in dance to be a good wife to lawyer husband Yeong-jak (Hwang Jung-min) and good mother to their adopted son. She does part-time teaching at a nearby dance studio but otherwise her life seems on hold, and sex with her handsome husband leaves her needing to finish things solo. Yeong-jak’s mother Byeong-han (Youn Yuh-jung) is stuck tending to a dying alcoholic husband who hasn’t met her sexual needs for years. But she has found a lover and is determined to enjoy life. Yet all the members of this ‘inconstant family’ (the literal title of the film) will be shocked by a sudden tragedy, before Ho-jeong can make her own way to her own life.
This is in one sense Moon So-ri’s break-out film: as Ho-jeong she is powerfully sexual, extremely vulnerable and entirely believable. In another sense, Youn’s Byeong-han is the youngest person in the film.