空有一颗愛他的心空有一颗愛她的心
[kōng yŏu yī kē ài tā de xīn kōng yŏu yī kē ài tā de xīn]
This shows conflicting sentiments of love where the user harbors affection towards both him and her. Yet it feels unrequited or incomplete, as suggested by 'empty', which gives off a lonely and yearning vibe.