电视剧《开端》片尾曲的歌名叫《My Only》，由周深演唱，完整的歌词如下：
My Only (《开端》电视剧片尾主题曲) - 周深
词：王仕琳
曲：金炫道
版权方：东阳正午阳光影视有限公司
和声：周深
录音/配唱：徐威@52Hz Studio（Shanghai）
混音/母带：赵靖 @SBMS Beijing
音乐总监：金炫道
音乐制作公司：（南京）十分有文化传媒有限公司
音乐统筹：Park Yeseo
特别鸣谢：周深工作室
You are the only
The only one who heals me
When I look into your eyes
I heard my heart beat oh oh
Please be my only
The only one who I need
How can I imagine life without you
Never leave me alone
Don't go far away
Just stay with me
You are my only
The only one who found me
In the darkness but only you saw me
Tomorrow just let it be
Cause I know you'll come with me
You are my only
Always believed in me
I will never be that weak-willed me
I'll be strong with you by me
How can I let you go away
You are my only
Always on my mind
But it's so hard to find out why
Dreaming of you every night
I wonder why you never know
You are my only
Always be there waiting for me
I will never leave
I will be right there for you
It seems like the real meaning
To me
