You grossly underestimate Jo's mental strength. He's definitely among the strongest players on tour mentally. He's never fazed by the occasions or the opponent, plays the same way against some journeyman in round 1 as in the final. He's never afraid to take it to the top players and take risks in crucial points. He never gets tight.
I'm pretty sure he will overcome the disappointment fast, he always does. It's exactly because of that mental strength that he's having so much success despite so many injury problems in his early years and his technical problems on the backhand and ROS.
again dude please take a break