Today, I am clearing outdated stuff in my office, and am getting ready to move to another office. When I opened the files marked "SLI", I found old photos with Professor Ko and our beloved students. He looked so happy. His smiles were always genuine with a subtle touch of child-like purity. Among the papers, I have found a handwritten note from him. He approved my application to an overseas conference on student mentoring. He wrote on my application : 100% support.