If you like the themes of growth, maturing, and the journey of life in "Twenty-Five Twenty-One," "Thirty-Nine is a great choice. The series follows three lifelong friends as they approach their upcoming 40th birthdays and reflect on their lives of love, friendship, and loss. In the show, Cha Mi-jo is a dermatologist who comes from a rich family. Jeong Chan-young works as an acting coach and is Mi-jo's closest friend. Jang Ju-hui is a cosmetics manager at a department store. The foundation of their friendship is strong, and will be tested when devastating news changes the course of their lives as they know it.