青春荒唐我不负你万劫不复我定陪你
[qīng chūn huāng táng wŏ bù fù nĭ wàn jié bù fù wŏ dìng péi nĭ]
Means 'though our youth has been reckless and frivolous, I'll never let you down. No matter how difficult, I will accompany you always.' Demonstrates loyalty and commitment through hardships.