In the whole world, the lights of many homes are on, and they are all reunion and harmony. Looking at these star-like lights, none of them are lit for me, so I can only stay alone.
This sentence is used to describe the lonely feeling when facing the reunion of others. The excitement of many other people highlights their loneliness and loneliness. This sentence expresses their inner loneliness and sadness, and a kind of helplessness and sadness that they can't find a sense of belonging.