1x14 - Moon in the Day

Chul Hwan finds Young Hwa and Jun O who have been hiding in a secret cabin with their friends. Min O appears just in time with the amulet, but Chul Hwan defeats him and finally gets a chance to kill Young Hwa. However, Jun O stops him, and Chul Hwan disappears. And since Jun O has completed his mission, saving Young Hwa, he disappears as well.