他心童但不能心痛我姓童所以我心痛
[tā xīn tóng dàn bù néng xīn tòng wŏ xìng tóng suŏ yĭ wŏ xīn tòng]
A play on words where 'Child Heart' (he has a childish heart) is associated with the person's surname being 'Tong' (which can mean child). The latter part conveys that they feel pain because others cannot empathize or 'feel the pain' of their heart, indicating loneliness and unshared experiences.