Four young men，Huan Ge, An Tu, Song Yu, Liang Zi, had been living in a rural part of Northeast China for all the their life. Their only way out to the outside world was lead by a long-narrow steamy train that took they to Beijing. The impact of money，desire and power that they gained by moving to this busy metropolitan city made their beloved friendship fell apart. The ups and downs life in Beijing also changed each of them to a different person.But their sincere n kind heart slowly awoke after "being lost".