Yu-jung, the 11 year-old girl who has an early first period, misunderstands that she’s dying and discloses her secret to the most intimate Seung-jun. When he is confessed love by Hye-mi, the prettiest in the school in 6th grade, Yu-jung feels jealous of them. The film depicts the precious moment of a little girl cutely and lovably, with only three child characters.