He attended 2014 Hanyang Winter School Completion Ceremony. You can see the group pic JKS took with students on Feb 20th Tree-J twitter.
Credits: 燕燕燕小宁
Original source: http://yixia.com/show/mnANNs7My~aunu~npI5yFQ__.htm
Credits: 燕燕燕小宁
Original source: http://yixia.com/show/mnANNs7My~aunu~npI5yFQ__.htm