Shortly after Sungwoo arrived in the Suwon village, he agonized over how to inform the villagers about the Japanese server's plan to invade Busan. He could not post a thread about it because it would leak the information to the enemy.
But Hanho solved his headache simply.
"Oh, that's easy. Let me leave a secret comment on an old thread posted by the Hwarang Guild."
If it was an old thread, nobody would confirm it anyway. So, if Hanho posted a secret comment and had the Hwarang Guild confirm it, he could relay a warning message to them.
"Oh, you are very smart in this field, Hanho."
"Of course, this is basic."
Hanho succeeded in delivering a message to the Hwarang Guild according to his idea.