The original korean for this naver endnote is '저래봬도 짱짱맨..'.
'짱짱맨' is used to describe someone who is 'The best of the best'.[1]
'저래봬도' is an abbreviation of '저러하여 뵈어도'[2], which means 'Even if you look at me like that,'.
When combined '저러하여 뵈어도 짱짱맨' translates into "Even if you see me like that, you're the greatest".