A hidden figure was seen leaving a pregnant woman, she was depressed until she gave birth to Bao. The first time Bao smiled, the tone lightened up and they both led happy lives, with Bao being a friendly person who was known for his smile. By the time he was 18, he was in a relationship with Ling. After they graduated, Ling broke up with him to focus on her studies. The tone darkened. It rained every day, Bao started only to care about the bad things in life and his signature smile disappeared. Bao had arguments with his mum, and then one day she came in to show him a picture of his dad (the father is hidden from view). And she told the story of how he left and she moved on because of Bao. They hugged and the tone lightened again. Five years later, Bao saw Ling while walking to work, they smiled and moved on.