Mum died when he birth. When Tau was a primary one student, a Yabei child accidentally walked into the residence of the Gangnanese and was beaten by Gangnam's children. When Tau discovered the child, he insisted on saving him and reported it to the police. Because of this, Pu was fascinated by him, but Tau had lost his only relative in the second year.Dad was killed by the Yabeiese ( 亞北人) because other Gangnanese reported his dad was an anti-government person. At the time, he wanted to resist, but Pu pressed him to the ground for save him. Finally, he could only look at his father gone.After that, he hated Yabeiese and decided to stop being nosy.

When Tau entered the kindergarten, Pu and his mother became his neighbour. On the first night, Pu’s mother wanted to cook for her son, who knows that the kitchen was on fire. After reaching the smell at home, Tau and his father immediately rushed to Pu's home and rescued the fire.As a result, the two families had dinner together that night, and Pu and Tau knew each other.

Pu's mother had published sudoku and other topics in the newspaper to earn extra money. Tau solved the problem quickly and accurately, thus exchangedPu's interest and respect. On the other hand, once Tau read a swearing in Gongnanese ( 港南語). When he asked his dad what that mean, his dad did not answer. Finally, he discovered the answer by Pu, and they became good friends.

When Tau's dad was gone, Pu's mom took care of him. When Tau entered the secondary school, Pu's mom died, so he lived in the dormitory of the secondary school with Pu. Because Pu's performance was quite excellent, he could choose a room and roommate priority, so they lived together naturally.

When Pu was form six, Tau inadvertently said "I want to graduate together" on his birthday, so Pu deliberately wrote a reality history on the examination papers of theHistory for relegated.

In the first year of the relegation, a Gangnanese senior, who was a friend with Pu, returned to school for visit everyone. After school, he ran to the chemistry lab and found Pu, so they chatted. However, the seniors interested in Pu and he wanted to rape him, but they were discovered by Tau. When Tau saw it, he could not thinking and picked up a pair of scissors to stabbed to the senior. After waking up, the senior is dead. After that, Pu handled everything, including cover up what Tau did, and reporting the mental state of the seniors to school and police. Finally things were ending in silence.

Before they graduated, Pu proposed cohabitation with Tau. He used his savings(scholarships, living expenses for a child, etc.) for finding a place to live together. During the searching, they found that the rent was too expensive or the environment was too bad. They failed to find the residence many times. Luckily, a man, who was a father of the child who was rescued by Tau found Tau. After asking, the man claimed to provide accommodation at a preferential price to repay him, but in fact he wanted his cooking skill. Pu knew the man's thoughts, but he did not say anything because Tau seemed to be happy.