@King reader 1 Well i do have some theories 1-he already knew but since some adeption don't show all the inner talk (like promised Neverland manga we now what they think in anime they don't show it)
2-they decide to change it a little to make readers not so knowledgeable about future events
3- it's just show other way around like a parallel au from the novel which he didn't it's her until later in the event ( at that time he didn't know which to put in novel should i make him know or not then decided to stick knowing there and in manhua not knowing )
4- maybe auther thought not knowing would be more likable and would add some thrill to manhua so change some things here and there and may add additional chapters to it