A System-crafted panacea whose recipe Jinwoo pieces together on his second descent into the Demon Castle. It stands as the only known answer to the coma-like Eternal Slumber, though it can be brewed in painfully few quantities.
Swallowing this potion erases any affliction at once, which is why it remains the single remedy ever found for Eternal Slumber. The trouble lies in supply: the recipe Jinwoo obtained produced a mere six bottles, leaving his whole reserve of the brew extremely scarce.
Drinking a dose wipes out whatever sickness grips the recipient. Across the original course of events Jinwoo emptied two bottles, the first on his mother and the second on Jinho's father, both to undo Eternal Slumber. Once the timeline was rewritten by the Cup of Reincarnation, he poured a final dose for Go Gunhee, granting him about ten years of life past his natural limit.
Documented recipients are Park Kyung-Hye and Yoo Myung-Han. The anime adds Cha Hae-In to that list, and in the reworked timeline following the reversal, Go Gunhee joins the recipients as well.

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In the original timeline Sung Jinwoo used the Holy Water of Life on his mother, Park Kyung-Hye, and on Jinho's father, Yoo Myung-Han, both to cure Eternal Slumber. After the timeline was rewritten he poured a final dose for Go Gunhee.
Yes. The Holy Water of Life is the only known remedy for the coma-like Eternal Slumber, and swallowing the potion erases any affliction at once.
The Holy Water of Life is a System-crafted panacea whose recipe Sung Jinwoo pieced together on his second descent into the Demon Castle. It is treated as an S-Rank consumable that cures all ailments.
The recipe Sung Jinwoo obtained produced only six bottles, leaving his whole reserve of the Holy Water of Life extremely scarce.
Documented recipients of the Holy Water of Life include Park Kyung-Hye and Yoo Myung-Han. The anime adds Cha Hae-In, and in the reworked timeline following the reversal Go Gunhee also receives a dose, granting him about ten years past his natural limit.
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