Pun design:

Spider + descending from the sky

Punning mechanism:

‘Zhi zhu (蜘蛛, spider)’ has a nickname ‘xi zi (蟢子)’ or ‘xi zhu (喜蛛)’ meaning the ‘lucky one’ or ‘lucky spider’.

Its first character ‘xi 喜(蟢)’ for ‘happiness (good luck)’ is then combined with the ...

This is a story from the Romance of the Western Chamber, a famous Chinese play written by Wang Shifu (王实甫, 1260-1336) in Yuan dynasty (1271-1368):

On his way to the capital to take civil-service exams, Scholar Zhang (张生) fell in love with the beautiful Cui Yingying (崔莺莺), who was stranded in a monastery. ...