顾影弄姿
[gù yĭng nòng zī]
'Behave Playfully By Enjoying One’s Reflection' often implies showing off or deliberately attracting attention. Literally enjoying playing around with one’s shadow/reflection, it describes people acting charmingly for the sake of being seen or admired. The idiom originally had a negative implication, now sometimes used more broadly just meaning playful charm or confident display.