Little Mom 2: The Day My Uncle Was Gone(2017)

Original title: 작은 엄마 2: 삼촌이 없던 날

Taichi watches as his uncle's wife and co-worker, Kumiko, struggle with a troubled marriage. Kumiko finally decided to divorce her uncle. Taichi feels his body heat up as he comforts her own little mother. Eventually, the two begin to covet each other while riding the heated atmosphere.