动量和动量定理

视频简介

When Dongjun first met Hyeji on a spring day, he just knew she was the girl of his dreams. So he works up the courage to talk to her, and ask for her number-but Hyeji declines, saying if they ever meet again, she will then give him her number. That evening, Dongjun gets a call from his best friend and finds out there was a surprise waiting for him.。