The protagonist of the novel is Yimo, a primary school bully who has lacked father's and mother's love since he was a child. He always uses a cheerful and sunny personality to cover up his fragile and sad heart. The other is Yixuan, a strong and steady young man who had to drop out of school and experienced a lot of setbacks and hardships. He always hides his tenderness in the darkness and indifference of his childhood. The two met each other through an accidental game. They influenced each other and encouraged each other. Yimo warmed Yixuan with sunshine, and Yixuan protected Yimo with strength. Under the bond between the two, even if they encounter tears and parting, they will always find warmth and hugs