Yeah. May 2nd it closed at 202,500 KrW per share. Next trading day, May 7th, it closed at 191,000, a 5.68% drop. It's "ringing" now. Went up to 198,000 on May 8th and back down to 193,000 on May 9th.
Basically all the big Korean game companies are reporting declines in sales. The assumption is when NCSOFT announces their 1Q 2014 numbers, it too will be underwhelming. Of course they will play up the improved royalties for B&S in China, the B&S anime series (it's on Cruchyroll if anyone cares) in Japan to prime that market for the game there and GW2 is entering Open Beta/Soft opening at the end of May, mid May for those who bought one of the 500K (sold out) early access spots, in China.
No idea how well their new mobile gaming games are doing. This is important because in the eyes of some media, PCs are dead (again!).