Olive Young T1 is on B1 (272 Gonghang-ro) and T2 on B1 (446 Je2terminal-daero), 6 am–10 pm, so you can stop by after check-in and before security. The 2 roller pins (헤어롤핀) have 1.3K+ reviews, rated 4.6, small enough for your pouch♡ T1 and T2 are far apart, so pick your departure terminal.