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Li Ran bid farewell to the campus and stepped into the cold society. In the midst of confusion, melancholy and pain, he felt the coldness of the world and the warmth of human relationships, and realized the meaning of living as a human being.

Due to the mysterious death of a friend, young Zhao Yunwei suddenly found that the way he viewed the world had completely changed, and he embarked on the path to find the meaning of life.

Destiny pushed the two teenagers to different paths. One was born in the mud like a lotus with a pure and spiritual spirit, and the other was like an earthworm flipping back and forth in the mud and never seeing the light of day. The two of them are experiencing different life journeys under the same blue sky, showing the value and meaning of their respective lives.