OB Beer, Cass Fresh advertisement model Ji Chang Wook will be heading to Busan for a fan signing event. Cass Beer and Cass TOK Party has organized a Summer festival and he will also appear in the summer concert which is part of the festival. This two events to be held on Aug 2 at the Busan Central west side and Haeundae water park will be even more bustling because of Ji Chang Wook’s participation.