작심삼일 作心三日

The idiom is a compound of 'Jaksim' (making up one's mind) and 'Samil' (three days). Historically, its origins are often linked to King Injo's reign during the Joseon Dynasty. It is said to have originated from a critique of politician Choi Myeong-gil, referring to how administrative policies would frequently change after just three days. While it was initially a political criticism regarding inconsistency in governance, modern usage focuses more on individual willpower and the common experience of failing to stick to new plans. Interestingly, modern interpretations have evolved to embrace 'positive resilience'—suggesting that even if a plan crumbles in three days, the key is to simply restart rather than give up entirely.