HappyNote is a very useful application tool that helps us think in a positive way about our daily life by recording 3 good things that we did or happened in a day. In the future, we have a plan to make better use of the application by measuring and analyzing what makes us happy with using wearable devices and other means. With Happy Note, we would like to help people feel they are valuable and find out his or her "place to be" in the community.