After graduating, Xiao Mo moved to Shenzhen, working as a bar singer and delivery driver. An accident led him to work on a construction site, where he composed a song that gained attention. Despite forming a successful band, he faces challenges that threaten the band's future.
Xu Wuqiu（32 years old）sits on the light rail preparing to see her father. Traveling by train again reminds her of when she eloped with her boyfriend when she was 24, escaping from her controlling father. When the light rail enters the tunnel, the unforgettable memories emerge with the old-style green train roaring out......
