Under the persistent but gentle guidance of Lee and Chen, the two teenagers gradually quit smoking and achieved better grades at school. Although the teenagers never realized it, both Lee and Chen were members of the "street corner" volunteer corps under the "Teacher Chang" service sponsored by the China Youth Corps (CYC) to help wayward juveniles in Taipei to find maturity and a better life.
如今，婉麗的功課一直在進步中，抽煙的習慣也早已戒除，但是她始終不知道她的大朋友昭英和學慧，竟是救國團甄選的義務「街頭張老師」﹘﹘她們的工作，就是協助經常出入不良場所或在鬧區遊盪的青少年。