骚年滥情不花心茹凉动心不上心
[sāo nián làn qíng bù huā xīn rú liáng dòng xīn bù shàng xīn]
Roughly translated as ‘Teen indulges in affairs easily but not fickle-hearted; appears emotionally touched on surface while heartless’. It describes someone, often a youth, showing superficial emotion or involvement yet maintaining emotional distance inside.