要有一颗不二心平平淡淡一起走
[yào yŏu yī kē bù èr xīn píng píng dàn dàn yī qĭ zŏu]
'Hold an undivided heart and walk together steadily.' Expresses a wish for a steady and loyal companionship where both partners remain true to each other without excitement or conflict, but in simplicity.