Daehyun was just a Valkyr, one of Odin's servants in Asgard.  For millenia, he and his brothers, Himchan and Jongup, had been collecting the souls of fallen heroes to prepare for the final battle: Ragnarok.  They were nothing more than divine beings born for that purpose, or so the gods reminded them often enough. Sent to Midgard in his brothers' stead, Daehyun finds and recruits many Einherjar for the ongoing war, including the warrior Zelo, the mage Youngjae, and... the thief Yonggu