My Taekwondo master also teaches Hapkido. I have been taking Taekwondo with him since 2013, and have taken a total of 16 tests for Taekwondo, including 1st and 2nd Dan tests, as well as 3 more tests since getting my black belt. I have done Hapkido off and on during that time (probably a year's worth of training during that time, once a week), and finally felt ready to test for my yellow belt. I have to say, while there might be more to remember at the macro level for Taekwondo, and the black belt test requires far more physical endurance for Taekwondo, this is the hardest test I've taken yet. Compared with any Taekwondo test I've taken, today I had: More corrections on my technique More attempts to do the techniques correctly More criticism to apply to future training I've worked longer to prepare for my yellow belt than I have for any Taekwondo test I've taken thus far. We had a new student today, and in class before the test he told me "you're not a white belt," and I told him I was actually planning on testing today. Even so, I was very nervous during the test, and several times had to stop, close my eyes, and breathe for a few seconds before trying something again. I am now 2nd Dan in Taekwondo, and yellow belt in Hapkido, and I'm just as proud of my yellow belt as I am of my 2nd Dan. (This is, of course, not to criticize Taekwondo, because it's a lot of fun and I've practiced really hard to get my techniques to where they are. It's just that with Taekwondo, it's mostly a matter of building muscle memory for me, whereas with Hapkido I have to really work hard to get my techniques correct).