温柔杀感情刀
[wēn róu shā găn qíng dāo]
This online name implies a seemingly gentle person who has a sharp and hurtful edge when it comes to matters of the heart. The phrase combines tenderness (温柔, gentleness) with emotional harm or betrayal (感情刀, emotion/knife). It suggests someone who might hurt others unintentionally because their kindness hides a cold and possibly harmful side.