Gong Yoo revealed he experienced anxiety after the success of his drama 'Guardian: The Lonely and Great God'.

On the September 29th Chuseok special of 'Pinggyego', Gong Yoo responded to questions about whether he's ever felt anxious, saying, "Of course. I'm not sure how you'll take this, but I think I experienced it once in my twenties and once in my thirties." 

The actor continued, "I don't think I can explain clearly why I was anxious. For example, 'Guardian: The Lonely and Great God' did very well, but I wasn't happy. I was happy it did well, but apart from that, there was a time when I felt so empty and I couldn't wake myself up. It's not that the work was hard or that it went well, I wasn't able to enjoy the spotlight when projects were a success."

Gong Yoo explained to say it wasn't easy to open up about, sharing, "It's hard to say this openly. It should be a time when other people would be so happy they feel like they're floating in the clouds, but if I say that my heart felt strange, it feels like I'm not grateful. After going through a hard time like that, the way I look at people around me changed. I felt like I was more nosy in that I didn't want them to go through the same hurt."