An inconspicuous ugly duckling accidentally met several princes, experienced several ups and downs, and missed good opportunities. In the tribulation, the ugly duckling learned to accept it calmly, but fate was as funny as a dream. The ugly duckling grew up slowly. A duck is a duck after all, but compared to the lonely swan, is it lucky? And can the prince change into a frog and be willing to hold this happy ugly little boy in his arms?