"Sometime, Sometime" peers into the uneventful everyday lives of Zi Kien and his single mother. One day he finds out that his mother has a new boyfriend, Mr Lee, and he is worried that he might lose her to this new stranger. Zi Kien decides to imitate adults like Mr Lee by copying their speech, their clothes, and smoking. However, Zi Kien's body is small for his age and he is still yet to become a man so his behavior does not match his physical appearance. Their lives remain uneventful until one night when his mother falls asleep drunk, Zi Kien touches her entangled hair and observes her wrinkled face. The next day she decides to get herself a 'haircut'. Both mother and son begin to act strangely in front of one another, a push and pull of deep desire for love and tenderness yet they get scared sometimes to care too much; causing their relationship to be riddled in anxiety. Because of this, their lives become just a little bit more interesting. They learn of their own unpredictable nature, and how they cope with life as it goes on.