云在青天水在瓶山有木兮木有枝
[yún zài qīng tiān shuĭ zài píng shān yŏu mù xī mù yŏu zhī]
This nickname conveys an image of tranquil nature, with clouds in the sky and water held in bottles. The lines evoke a peaceful scene while hinting at unspoken yet profound feelings between two persons.