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It's so wild to me that I used to read Sentinel/Guide fanfiction and to see the Sentinel!verse in BL... it's cool to see it in manhwa but makes me sad that no one knows that Jim and Blair are the original Sentinel (I guess they're calling it 'Esper' now) and Guide. Can't beat the OGs.
I love all BLs with Guides though, makes me feel nostalgic.