雲消霧散

the clouds melt and the mists disperse (idiom) / to clear up / to vanish into thin air

surname Yun / abbr. for Yunnan Province 雲南省|云南省[Yun2 nan2 Sheng3]

cloud / CL:朵[duo3]

to disappear / to vanish / to eliminate / to spend (time) / have to / need

fog / mist / CL:場|场[chang2],陣|阵[zhen4]

variant of 散[san4]

scattered / loose / to come loose / to fall apart / leisurely / powdered medicine

to scatter / to break up (a meeting etc) / to disperse / to disseminate / to dispel / (coll.) to sack