I don't think you understood. You use it to see the monster you need to kill 100 of to get a point, and when you get a specific amount of points, you can do the kick skills (except flying kick) without having to do a stance.
I'm wondering, when you get Taekwon Ranker (Getting the specific amount of points, therefore completing Taekwon Mission) if you will still be able to use the skills without the stance, or if that is gone.
EDIT:
Here is the skill description again.
Quote:Taekwon Mission (LV 1)
Active
Requires Fighting Chant LV 5
Description: You can use this skill only if you are TK Boy. You cannot use this skill once you switch to Soul Linker or Star Knight. When you use this skill, you will see the name of the monster you are currently attacking. Then, if you kill that same monster for 100 times (does not have to be in a row), you get 1 Point, and you will be assigned a new randomly selected monster.
When you use this skill while your Target Percent is at 0%, you have 1% chance to receive a new target to take.
When you become Taekwon Ranker (No effect if you are already Star Knight or Soul Linker), you can do infinite combo of all kicks - Whirlwind Kick, Round Kick, Axe Kick, Counter Kick. However, you cannot do Flying Side Kick as part of infinite combo.
LV / Casting Time / SP Taken
1 - 1 Sec. - 10