The moon on the sea is the moon in the sky, and the person in front of you is your sweetheart.
When An Hao was a child, she only thought this sentence was so beautiful. It was not until later that she knew the second half of it. However, her heart was just that of a spectator, and she was the character in the play.
She also finally understood that the moon on the sea was beyond her reach, and the people in front of her were beyond her reach.