Thanks for the chapter!
In LN during the night they were attacked by Undead wolves and she found a ring Alan recognized as that of having a lot of personal value for one of his previous party members giving him an inkling on who cursed him. Planned on returning it along with asking why cursed. Seemed kind of odd though. Being the hero's party you'd think they could have bought something else like another ring to use for the curse instead of something unique with sentimental value. Unless the plan was for him to realize who cursed him or trick him into thinking ring owner cursed him just in case the curse was broken. My bet is Edmund the seer considering his arrogant personality, knowledge about various things which would include curses, laughed at Alan despite all the help he'd given when they started out and could have been laughing because trying to hold in how Alan wasn't getting old but was cursed by him. Also, his appearance resembles the guy who cursed Ravi if take glasses off and put him in a robe although that just might be due to artist's drawing style and a coincidence. That kamikaze fighter seemed too shallow and muscle brained to comprehend on how to curse someone other than with lame insults. Didn't get much of an impression on other three one way or other so possible could have been one of them too.
@BlurEyes Can't say for sure since how curses work not detailed enough but could be the item mixes with the curse when cast and forms a curse aura that's harder to detect than an obvious seal or symbol like the one that appeared on Ravi while she was cursed. Then when curse broken the aura shifts back to the item used sans curse. Otherwise part of the curse would have to include people not noticing or perceiving the cursed object being worn by the cursed person. Considering Douglas knows the history of the ring he'd definitely have noticed wearing it when washing his hands or taking a bath.
@Svelandria Oops, nice catch. I got Alan and Douglas mixed up. I was just saying unless part of the curse makes the cursed, in this case Douglas, unable to notice the ring or transforms the ring into energy/magic power or something he would've noticed he was wearing it at some point as he immediately recognized it as Alan's after curse removed.