The Paladin (The King Eternal Monarch AU)

This is an Alternate Universe where Elizabeth (AU JeongTae Eul) is royalty and James (AU Lee Gon) is a Paladin - one of four special guards to the usurper King.
Five years after the night of the coup, James still served the usurper King despite deep personal misgivings. As a Paladin, he was sworn to serve the Crown for life. With the formal King's entire bloodline destroyed, there was no future in rebelling. Or was there?

When the woman that James Lee saved from drowning turns out to be someone else altogether, would he kill her or would he die trying to save her?