Which one as a cute Korean Drummer? That is the right one.
Added regarding Keiko Agena:
No, that is not weird at all. MANY times teenager roles are played by 20-something actors. There are two main reasons for this. (1) Actors who are MINORS trigger a whole big bunch of extra laws in California (Hollywood) that involve child labour laws and education laws. High school age and younger require the studios to provide on-set tutors for various subjects. Other adult supervision is also mandated. Plus, there are extra limits on the number of hours per day that the actor is permitted to work. (2) Freaking parents.
Once the actor is 18 or older, things become suddenly MUCH simpler and cheaper.
More worrisome and more important, is the problem of on-screen drum time. For some BIZARRE reason, Drummers are not permitted to be shown on the screen ACTUALLY playing the drum kit on track with the sound track for more than a few seconds per show. This is apparently NOT a California law, per se, but some kind of Satanic Communist plot against Drummers. <Patriarchy!>