1도 모르겠다

"Il-do Mo-reu-get-da" (The '1' is pronounced 'il' in Korean, making the phrase sound like "il-do mo-reu-get-da.")

This meme originated on April 13, 2014, when Henry submitted the answer "모라고 했는지 1도 몰으갰습니다." (I don't understand even 1 degree of what you said) on episode 54 of the MBC variety show 'Real Men'. Following this broadcast, it quickly gained popularity online. By the 2020s, "1도 모르겠다" became a common expression, often used in daily life instead of "하나도 모르겠다" (I don't understand anything at all).

"1도 모르겠다" is an expression where "하나" (hana), meaning "one" or "a single thing," in the phrase "하나도 모르겠다" (I don't understand a single thing), is replaced with the numeral '1'. Here, "하나" does not refer to the number one but is a noun used to mean "not at all" or "not even a little." Therefore, it is not grammatically correct, and the National Institute of Korean Language has stated that its pronunciation and spelling are inappropriate. Nevertheless, this expression is widely used to emphasize the meaning of "I don't understand at all" or to convey it in a lighthearted and humorous way.

When this meme first became popular in 2014, it gained traction primarily among young people and internet community users as an "insider joke." Subsequently, as it was used in various media such as subtitles on terrestrial and cable broadcasts and advertisements, it became a widely recognized and used expression across all generations. It is a widespread slang term found among both men and women.

• "모라고 했는지 1도 몰으갰습니다." (Henry, Real Men)
• "당최 못 알아듣겠어 1도[일도]" (I can't understand it at all, not even 1 degree) (Lyrics from EXID's 'AH YEAH')
• Apink's song title: <1도 없어> (Not Even 1 Degree)
• Used in a Coway water purifier commercial, emphasizing the '1'.

• Jin Yang-cheol in the drama 'Reborn Rich', Kang In-gu in 'Narco-Saints', and Cha Mu-sik in 'Casino' all used this expression.