不求一心但求用心
[bù qiú yī xīn dàn qiú yòng xīn]
It means 'I don't ask for full commitment, but I do ask for sincerity.' This online name shows that although the person does not require a completely devoted heart, they hope to deal with things sincerely and wholeheartedly. A down-to-earth person may choose this username to express their pragmatic and sincere attitude towards life and others.