The four words at the end of a love story

Love at first sight, human nature, local conditions and customs, touching the scene, being ambiguous with birds, being unkind, easy to talk, flirting, brotherly affection, moving with affection, running water is ruthless, fish and water are affectionate, touching the scene, ruthless, carefree, heartless, looking at the clouds, impartial, customs and habits, heavy and affectionate, ruthless. ....

Hope to adopt! ! ! These are idioms.