爱与诚歌词表达了什么

When a young hiker stumbles onto an isolated farm after losing her way on the Appalachian Trail, she is taken in by a strange yet beautiful couple desperate to protect a secret deep in the mountains.。为了给老婆治病，苏晨欠下了巨额债务，不得不出国务工，将女儿楠楠留给了外婆照顾，临走之前，种下了一棵小树苗，说树苗跟楠楠长的一样高的时候，爸爸就回来了.......。