Iris is French but she is staying in Korea for the time being, we have no clue why she ended up here but we know she needs to make ends meet so she is being creative and starts to teach French using her unique "method".
The film is very down-to-earth yet very poetic and curiously revolves around language and communication. And miscommunication sometimes. Or refusal to communicate or listen. Also, it is about the social and interpersonal distance between people who know each other and who don't and how this "accepted" distance can change or vary depending on various factors like cultural norms, the place of the conversation, the mood, etc. The storyline is simple, but what we're more interested in is the nuances. We're not interested to know what will HAPPEN to Iris or the other characters but how they will react at a certain point of the conversation, what they will feel and say and how they will do it. Additionally, the character of Iris is truly interesting and some little bits of her true self are gradually revealed but there is a lot left for us to think out. Very subtle, authentic and elaborate work while being simple at the same time.