People tend to ask less questions if they meld into social situations seamlessly.
[ aka he reacts so that no one will have to question him. However, it's different from putting on a mask. Shizuku is right in a way—Hien would be having fun if he genuinely felt those feelings. But for now, he can't, so he reacts in a way what he would have done if he could genuinely feel, so it's not really a lie.
But all this is pretty much admitting that he isn't really happy, so what Shizuku does is working. ]
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[ aka he reacts so that no one will have to question him. However, it's different from putting on a mask. Shizuku is right in a way—Hien would be having fun if he genuinely felt those feelings. But for now, he can't, so he reacts in a way what he would have done if he could genuinely feel, so it's not really a lie.
But all this is pretty much admitting that he isn't really happy, so what Shizuku does is working. ]