After a one-night stand between independent designer Lina and wealthy CEO Leon, Leon is forced to leave the country due to a family crisis and goes out of contact. Lina gives birth to their son, Leo, alone. Three years later, three-year-old Leo finds his way to Leon's company using a photo and shouts "Daddy!" in front of everyone, stunning the crowd. After confirming paternity, Leon desperately tries to win Lina back, with Leo playfully helping reunite his parents. Vivian, Leon's childhood sweetheart, repeatedly schemes against Lina, but each time the father-son duo manages to overcome her plots. In the end, Leon successfully proposes, and the trio begins a happy life together.
