When Grand Chase meet him, he is possessed by something and is drinking all the water of his Fen. Guang appears to be resisting towards the Darkness, and tells Jin to run (who seemingly doesn't respond to this due to his rage). They start running until they are forced to fight back, where Jin advises the Head is the Weak Point. Once they defeat him, King Guang thanks Jin for saving him, then fades away as the water is released back to wherever it came from. Before he dies, he asks Jin to avenge him as his final wish. Jin is sorrowed, shouting his name in tears, but his comrades convince him to let go of his sorrow. The group proceeds to avenge King Guang so that he may rest in peace.