"I Don't Know" by Apink, is a Korean pop song that revolves around unrequited love and the frustration of not being understood or noticed by the person they have feelings for. The lyrics express the narrator's longing for their love interest to recognize their feelings, their struggles to get closer to them, and their frustration that despite their efforts, the person remains oblivious to their emotions. The verses express the narrator's plea for the love interest to stop pretending and to acknowledge their feelings. They speak of how the love interest lacks awareness of their emotions, even after they've revealed their heart countless times. The beginning of the chorus reflects the narrator's frustration and confusion, questioning how the love interest can be so unaware of their deep affection. Overall, "I Don't Know" delves into the frustration, longing, and one-sided affection experienced by someone trying to make their feelings known to an oblivious love interest. It portrays the pain of yearning for reciprocation and the struggle of feeling invisible.
—SongTell