心存我者以心换心存我心者以真换真
[xīn cún wŏ zhĕ yĭ xīn huàn xīn cún wŏ xīn zhĕ yĭ zhēn huàn zhēn]
Saying goes: 'Those who cherish me exchange hearts wholeheartedly, those with whom I have exchanged true heart feelings deserve sincerity in turn' It indicates deep trust and devotion reciprocated by honesty towards each other