Wong Yu Fei was raised by her father, Wong Kwok Ming, a garage owner, after her mother's death, but she never felt her mother's love. After returning to Hong Kong, Yufei discovers that her father often leaves town during working hours. With her best friend V, she decides to investigate. During one of their drone flights, they witness her father entering an old building and uncover a secret: her father is hiding the truth about her mother's death many years ago, involving Sun Lijun.