Responses

Don't think he is a random addition tbh. There's already the implication that the guy was gonna play a (slight or not) bigger part in the whole story. The way he essentially got rid of Hyo Un when he was introduced + then how the MC talked about him + ordering the MCs death. The author should have done more about giving him a more obvious motivation but his place definitely isn't random.
why is the manga just being rushed and going into a weird direction? some explain wtf is happening