Secret is on at the Myeong-dong Cinus Theater:
Thursday (10th) - 1145 and 2410
Friday (11th) - 1105 and 2400
And at the Gangnam Cinus Theater:
Friday (11th) - 1050
Saturday (12th) - 1050, 1300 and 1510
Sunday (13th) - 1050, 1300 and 1510
I'll update weekend times as they appear. All listings are correct at time of posting, but may be found frolicking with reindeer...
UPDATE: Well Cinus seem to be playing silly buggers again. The subtitled listings have disappeared from naver for the moment. Hopefully they'll pop back up again sometimes soon.