Three children born on the same day, the same month, and the same year, became brothers and sisters without blood by chance. Although they have the same birthday and grew up under the same roof, they have very different personalities. Because of the influence of the original family, they have their own considerations when facing love, family or personal problems, and different choices have also created different fates in the future. After going through all the trials and tribulations of life, will they be able to re-examine the relationship between their family members, compare their hearts with their hearts, and reconcile with the past?