Wow! So KyuSaeng was in Cebu for freaking five days. According to what I read from Liezel they took the midnight flight from Bangkok on December 13th back to Seoul. And on the same day they went to Cebu so they were in Cebu from December 13 - December 18!
Well actually some fan clubs do know about their secret trip. Most people are saying it's for their DVD that will be released in Japan.
Following photos are from 
