装作无所谓却笑的好狼狈
[zhuāng zuò wú suŏ wèi què xiào de hăo láng bèi]
This means 'pretend not to care but end up laughing awkwardly'. It depicts the contradiction between someone's true feelings and how they want others to perceive them - wanting to appear indifferent, yet unable to hide their inner vulnerability, which may come off as being uncomfortable.