白发菇凉不离黑发先生黑发先生不弃白发菇凉
[bái fā gū liáng bù lí hēi fā xiān shēng hēi fā xiān shēng bù qì bái fā gū liáng]
This username depicts a steadfast and loyal love relationship. Here, '菇凉' is a phonetic pun that sounds similar to '姑娘', meaning 'girl'; it implies a story where a white-haired girl vows not to leave her black-haired man and he promises never to abandon her. This signifies undying commitment.