I recommend 'The Gangster Queen' to you. Although this novel was an ancient romance novel, it was also a father-son theme. The protagonist, Su Xiaoxiao, became a mother after transmigrating, but her son's father disappeared. Thus, the story of her bringing her son around to find a cheap father began. Although the father is not a gangster, I believe that you will like this novel because of the relaxed and funny plot and the deep affection between the mother and son. I hope you like this fairy's recommendation. Muah ~😗