I was devastated to hear about Weihan's passing. We first met during our microeconomics class in the MSc at LSE. His friendliness and positive attitude were contagious and we quickly became friends. We spent another six years together during our PhD being office neighbours and having countless discussions on the many research interests that we shared. Weihan's humour, kindness, and cheerfulness never failed to put a smile on my face. No matter how tough things were, he would always find the positive side and put everyone in a great mood. I remember how happy he was to become a father and my thoughts go to his wife and son in these difficult times. You will be missed dearly Weihan.