Wàimài xiǎogē gěi dújū lǎorén sòng fàn, tài nuǎnxīn le.
The delivery guy bringing meals to elderly people living alone — so heartwarming.
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Colloquial and very common online — used to praise small kind gestures, especially in news headlines about 暖心故事 (heartwarming stories) and 暖心举动 (heartwarming acts). Marketing copy uses 暖心服务 (considerate service) constantly.