Unfortunately, the film loses its purpose. The story turns out to be much longer than necessary, losing itself along the way. The cinematography and editing seem to have lacked proper attention, and we experience a sense of awkwardness in certain scenes, with framing that feels worse than home videos. The most interesting aspect of the film is when Iris describes her idea of teaching and how she believes that emotionally connecting with a language can help us express ourselves in it. However, this idea is not well developed.
At first, it seems intriguing that she let her students to do as they please and explore those moments on their own (such as playing instruments), but as the film progresses, it becomes clear that she doesn't care as much as her dialogue initially suggests, making it shallow. It could have been amusing to compare the experiences of the two students and how emotions are so universal, but the text - identical down to every comma - comes across as sheer laziness in writing something different.
When we compare both students to Iris, we see that the latter breaks the "rule" by playing the flute in the park without any talent and without caring. However, I don't think we can say she feels happy doing so; her emotions are not well explored (except for the scene where she talks to her friend in the apartment). I believe the film tried to explore the concept of a life of simple pleasures, as seen in "Perfect Days", but it ended up falling into monotony and a lack of meaning.
