Traveling Through Parallel Worlds and Starting as a Wilderness Anchor

An ordinary young man on earth travels across an isolated island in a parallel world. One person and one dog survived alone on an isolated island. As time goes by, the young man cannot bear the loneliness and is about to have a mental breakdown. A girl who has experienced a shipwreck and lives on an isolated island (maybe the heroine, maybe not, because I didn't write the following plot when I wrote the introduction) It brought him hope and started his live broadcast career on the desert island using the mobile phone brought by the girl.