Big Bang's T.O.P and JYJ's Junsu joined the military on Thursday, offering simple messages to their fans with newly-taken pictures via Instagram.
"Thank you for the love over the past 13 years, along with unforgettable memories," Junsu said.
"I decided to upload a picture of myself because I think I'd better say goodbye properly."
T.O.P said, "I'm sorry but I really want it to be low-key. Please understand me even though I'm leaving without saying bye," he said.
T.O.P, 29, shared his own photos with short hair.
Big Bang member G-Dragon also posted a picture of T.O.P and himself via Instagram on Wednesday.
Fans were spotted in front of the training camp in Nonsan.
Some fans had been waiting for their stars from 5 a.m.
T.O.P and Junsu will go through the basic military training for four weeks before getting assigned duties at police agencies in Gyeonggi and Seoul.