I think what they did was very tasteful and really focused on Jonghyun's light and comforting those who might feel the same way.
All the quotes were basically all the times Jonghyun talked about feelign sad but knowing that he wasn't alone and that he would always be there for people who are suffering in the same way he was. It was all about hope.
Then Lee Hi performed her some 'Breathe' which is also a similar theme, only she had to stop in the second verse because she started crying. The crowd cheered her on and she was able to finish the chorus.