少女不悔为他心血淋漓少年不枉为她背叛世界
[shăo nǚ bù huĭ wéi tā xīn xuè lín lí shăo nián bù wăng wéi tā bèi pàn shì jiè]
This expresses deep commitment, stating that a girl feels no regret spilling her heart out for him, while a boy feels his actions for her are justified even if it means betraying the world. It highlights intense and passionate youthful love.