電影《甲洞》預熱宣傳曲《fuying&sam保護》的歌詞如下：
女：
Fuying and Sam protect me
男：
Every time I fall, you pick me up
女：
No one could ever love me like you do
男：
Even when I'm not feeling strong
女：
You make me feel like a million bucks
男：
So here's to the love that's never lost
女：
And the memories that we've made
男：
Forever in my heart, you'll stay
女：
Fuying and Sam protect me
合：
I'll always believe in forever
女：
Sometimes the world gets so complicated
男：
But I don't ever want it to leave our sideline in my head there's this endless symphony that you create that my heart pumps every second just for you I may have felt lonely and defeated at times, but with you by my side, I won't be giving up no time soon You know that I am so glad I found you. It's not every day that we meet someone so amazing, someone so unbelievable You give me a reason to live. You give me hope and courage, and I want to make sure that I show you the same. Because you deserve it. You deserve the best. And I will do anything to make sure that it stays this way. So here's to the love that's never lost. And the memories that we've made Forever in my heart, you'll stay Fuying and Sam protect me I'll always believe in forever And even when I fall, you pick me up Every time I lose my way, you lead the way And even when I'm feeling low, you lift me up And every day is a celebration of our love, our forever love Fuying and Sam protect me Forever.
這首歌表達了男女主角之間堅定不移的愛情，每次男主角在女主角低落的時候都會支持她、幫助她，給予她希望和勇氣。而女主角也對男主角不離不棄，共同經歷生活中的風風雨雨，享受愛情的喜悅。歌曲鼓勵聽眾永遠相信愛情，珍惜身邊的愛情，不論何時何地都相信對方會一直陪伴在自己身邊。