Two items: an official participation certificate of the Rio 2016 Summer Olympic Games issued to Seonkoo Park, one page, 8.25 x 11.75, with IOC and Rio logos to upper corners and trilingual text below, reading: "In recognition and appreciation of your contribution to the success of the XXXI Olympiad"; and an official participation medal of the Rio 2016 Summer Olympic Games. Alloy copper, 44 x 50, 100 gm. The front features the Rio Games logo above Olympic rings; the reverse bears flowing designs above three rows of raised text, “XXXI Olympiad Rio 2016.” Includes the original presentation holder and slipcase, as well as an "Olympic Closing Ceremony Marching Pass."