倾盖如故白首如新

This name reflects the feeling of becoming close friends instantly, yet maintaining an ever-new heart towards each other as if it's the first meeting. It combines 'at-first-sight-as-if-old-friends' and 'the-long-term-friendship-remaining-as-fresh-as-the-first-day'. This idiom indicates an extraordinary harmony between two people, who meet briefly but feel like old acquaintances, and whose deep connection remains fresh over time.