魏你心动刘你于心
[wèi nĭ xīn dòng liú nĭ yú xīn]
This username combines Chinese surnames with romantic expressions. “魏你心动” (Wei for you, my heart beats) suggests that someone's charm stirs up affection or excitement; and “刘你于心” (Liu lingers in the heart) implies deep remembrance or longing of another person named Liu.