Maybe the friend is jealous of the mom's life. For example, if the mom has a happy family or a successful career, the friend might feel envious and try to gain some advantage over her through blackmail.
The 'A Bad Friend' manhwa's main plot centers around the ups and downs of friendship. It follows the characters as they encounter various situations that reveal the true nature of their friendships and force them to make tough choices.
Well, my friend's mom is a fitness enthusiast. She organizes fitness sessions in their backyard sometimes. One day, she invited me and some other friends to join. She taught us some new yoga poses and told us how fitness has been an important part of her life for years. It was a hot (inspirational) story as she motivated us to take care of our bodies better.
Once my friend's mom was a volunteer at a local animal shelter. She would often bring home stray animals to nurse them back to health. One day, she found a little kitten with a broken leg. She took it in, got it proper medical treatment, and within weeks, the kitten was running around happily. It was so inspiring to see how much she cared for those animals.
The sons' black friend could be a great artist. He might have shown the mom and sons his paintings which were inspired by his life experiences. This led to a deeper understanding of his creativity and emotions within the family.