1. Old Iheon and Young Iheon are the same person, meaning Huimin could've had an amnesia OR he does have 2 personas, leading to my next theory;
2. Huimin had been in a coma for ten-ish years, that's why Iheon is a grown up now but Huimin still in his twenties body (you know when people in a coma their body won't grow up yada yada)
BUT one thing I've been thinking abt, if either these theories are true: why omega verse exist in his world now?
We know at the beginning of the story it was only in the book that omega verse exist, Huimin himself questioning what is that to his sister, so we can say that they're real world is just a normal world.
I might be wrong (this is just a theories after all), but if either these theories are true, welp then it's just another plot hole by the author or we missing smth
p.s. yes im suspicious too why Iheon acting that way in recent chap, it's like he KNOWS the past Huimin and now trying to reenact all of their memories to poke Huimin's mind or smth AAAAAAA the plot is plotting
NEED THEM AS MY DADS. NOW.