"I may be smiling now, but you dont want to see me dying behind my mask..." (Y/n) (L/n), a girl to be known mysterious, behind her smile, there is her dark past, she kept using her mask behind her darkness, She once met a boy named Killua Zoldyck in her school, he was one of her old friend, he knew something was off about her, and once he knew her past life, Will he stay with her? Or... Will he leave her dying behind?