40+ Love IV is about an innocent love between a woman in 40's and a man in 20's. This innocent love doesn't have any contract but freedom. The innocent love believes in freedom in love. When the love is real, there is no limit but a freedom. There are ups and downs, hopes and frustrations, and laughs and cries. During the journey of this innocent love, this woman and man explore the world and grow together. There is a passion and there is calmness. There is a storm and there is a peace. There is a doubt and there is a hope. Make it or break it is still unknown. Uncertainty and unknown world are their friends. They feel good about the uncertainty. As long as they want, they meet each other. There is no definition about their relationship but there is love. Undefined love is an innocent love.