It was a great privilege for me to have known Weihan and shared the office with him for years, but above all to have shared thoughts and reflection, never naïve and always profound, always expressed with unparalleled grace and cheerfulness. He was a person of great openness, with whom everything could be discussed, freely and openly, always brilliant and jovial. I'll never forget these human traits. My deepest condolonces and a big hug to all his family, whom, as reflected in every conversation we had, he loved so much.