So many theories about the true identity of 'Korean', he certainly is an interesting specimen.
I used to think he was JayAtl's alt after he got banned, but then they started posting simultaneously with regularity, and it takes far too much time and effort to keep that up, even for a basement-dwelling pariah. Also, he is fairly well-versed with East-Asian issues, but deliberately interprets them in the most revisionist manner, something beyond the capabilities of JayAtl.
I still think he's some DPP Taiwanese. When he comments on Taiwan, his opinions are pretty consistent with the DPP extremists who want to carve out a 'Republic of Formosa' on RoC territory. He has no demonstrated skill at Korean, but is suspiciously competent in Chinese and Japanese, something usually only Taiwanese rape-babies left behind from Japanese occupation are capable of.
He's definitely not an ethnic Korean though. Apart from his non-existent Korean skill, his personality also sells himself out. Everywhere Koreans go, including cyberspace, their behavior is marked by 'passion' and pathological emotion (Hwabyeong). In contrast, this false-flagger has a kind of cold, twisted nonchalance, completely lacking in emotion.