From 19 to 23 August 2018, Professor Sienho Yee was invited to attend the 2018 Biennial Meeting of the International Law Association in Sydney, Australia. During the meeting, Professor Yee made a speech topic on "We should be both comparative and international" aiming at the disscussion of "whether international law is international or not", and participated in the working sessions of "Marine Baseline Commission" and "Study Group on General Legal Principles Derived from Domestic Law" as a member of Headquarters. Meanwhile, Professor Yee also had in-depth communication with other participants.