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Moondae and Changryeo is cousin, remember the accident that Changryeo got into which leads him unable to do sports again? The same accident kills mondae's parents, I'm not talking about this moondae, but his real identity, the one that took civil exam (forgot his real name)

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I think they mean Cheongryeo from VTIC, not Chungwoo. He was the host of the system before Moondae but failed/died multiple times trying to clear his missions and became a psychopath. He has a frenemy sort of relationship with Moondae where they trade information about the system but for different objectives. Cheongryeo wants to return to the past again (and thinks Moondae’s death is the key) while Moondae just wants to clear all his status abnormalities (in the same timeline) and find out the system’s objective.