I don't know even 1

"I don't know even 1" is a trending phrase derived from replacing "하나도 모르겠다" (I don't know anything) with the number "1" for "하나" (one). This phrase originated from the April 13, 2014, broadcast of MBC's variety show "Real Men," episode 54, where singer Henry wrote on his training answer sheet, "I don't know even 1 of what you said" (모라고 했는지 1도 몰으갰습니다).

As a Canadian native, Henry was unfamiliar with Korean grammar and mistakenly substituted "하나" with "1." This scene was aired and brought great laughter to viewers.

After the broadcast, "I don't know even 1" quickly spread through online communities and social media, becoming a widely used phrase in daily life. It emphasizes a complete lack of understanding and has evolved into variations like "1도 없다" (not even 1 exists) and "1도 안 했다" (didn't do even 1), used in various contexts.

While the expression is technically grammatically incorrect, some have criticized it as an example of language degradation. Nevertheless, "I don't know even 1" remains a widely embraced part of popular culture and wordplay.