Seok Hwa = doctor from Jeju Island, has the weakest health (he faints now and then), he seems to be a mutant (something in his genetic is changed, don't know if is since birth or not) and has a problem expressing emotions.
Captain = high rank military, carefree and really strong; noticed to be a troublemaker but is really smart, he needs to take care of the doctor while keeping an eye on him to make sure he is not a rebel.
Rainbow City