我会永远笑着扮演你的配角
[wŏ huì yŏng yuăn xiào zhe bàn yăn nĭ de pèi jiăo]
Translated as 'I will forever play your supporting role with a smile', the net name implies someone who is contented in playing a supporting role in another person's life, always being there with positivity and without seeking to be in the spotlight themselves.