Marriage is intended to be a life-long contract; some people believe that such a long-term relationship will lead to increased happiness and greater achievements in other aspects of their shared lives. In this project, a "self control" or mutual trust test is designed for married couples. Marks on the test have been developed by linking "grading" in Taekwondo with the format of the Marshmallow Test as indicators of one's commitment to marriage. The logic of the Marshmallow Test is to set up situations which involve avoiding temptation in the hope of a long-term gain, and the logic of Taekwondo is that exercising self-control makes one stronger. Research in this project found that the self-control/mutual trust between husband and wife is divided into many aspects, but the key issue centred on reasons why their partners cheat. A humorous expression of the issue of sexual temptation in marriage is expressed by an annual exam for married couples, who are required to sit through an adult version of Marshmallow Test in order to find whether or not they are improving in their relationship. After each test, they will be given a level of wedding ring that corresponds to their test scores; the levels are inspired by Taekwondo's grading system and refer to each level's belt colour. By taking these tests, the couple will be informed of what stage they are in in their relationship. This humorous test is intended to highlight the universal significance of mutual trust.