Kimg Jae Hoon and Kim Dong Hwan vs Kasumi and Ayane
Kaphwan Taekowndo vs Mugen Tenshin Ninjitsu.
With Kasumi back in the Mugen Tenshin clan (Hayate, despite the disapproval, has ordered the death sentence lifted), the feud between the Destined Kunoichi and the Female Tengu has simmered down into a rivalry.
Which they put to the side as they are in Seoul, since they have heard that Alpha-151 was seen around the Seoul offices of DOATEC and Hayate sends them both in to investigate.
Unfortunately, they arrive too late, since Alpha is long gone from Seoul. Disappointed, they decide to hang around Seoul before returning to Japan.
It is there they decide to visit the local dojang of a famous Taekowndo master, Kim Kaphwan. Kim isn't there, but his two sons are, Kim Jae Hoon and Kim Dong Hwan, with their 'uncle,' Jhun Hoon.
Not liking where this is going, Kasumi warns Ayane of outside fighting. Ayane ignores her and throws down the challenge to the two boys. Dong Hwan accepts on behalf of the Kaphwan familf, much to Jae Hoon's chargin.