I am still learning Jenet myself, so I'm not very knowledgeable about her. On the other hand, I can give you a few pointers with Jae Hoon.
- If you press B during his back dash, Jae Hoon will hop forward with a launcher kick, you can kara-cancel it during the start up, and it's also cancelable into specials/supers when it actually hits. One strategy you can do with Jae Hoon is if your opponent blocks the launcher kick, you do his QCF+B and it can totally surprise your opponent when they least expect it.
- Jae Hoon's QCF+P has autoguard properties during start-up and you can hold it down with the punch button. It's a great move to punish jump-in's and occasionally bait attacks. But it is very punishable on block. Most of Jae Hoon's specials are all very punishable, so keep that in mind.
- Jae Hoon's Hien Zan Brake (Hien Zan is down by holding d, then tap u + K, while you perform a brake by tapping A+B during the initial frames for that specific special move) is really good, and is one of his best moves. Sometimes if you trade hits with it against your opponent, you can do his QCFx2 + K super right as you recover and really fuck up your opponent.
Jae Hoon is pretty damn good because he can do huge damage with just a couple hits, and the fact he can pull a super off a trade is quite ridiculous. He can punish alot of stuff, but the fact most of his stuff is also punishable kinda hinders him. You have to really balance offense and defense with Jae Hoon, and mix it up hard to try to keep surprising your opponent.