铁石心肠我做不到铁血无情我做不到
[tiĕ shí xīn cháng wŏ zuò bù dào tiĕ xuè wú qíng wŏ zuò bù dào]
'Heartless, I cannot; ruthless, I cannot'. The user is declaring they are unable to be cold-hearted or unfeeling, emphasizing their inability to harden their heart and express the value they place on human compassion.