screw the criticism author-nim, 'Instagram' was one of my fav out of all ff I've ever read in wattpad.. you did well.. this might be an unpopular opinion, but i love how u left the ending to be open ended (for some reason ppl just don't understand the concept of an open ending but it was the best way to end it imo)
and tbh i think even making a sequel to it would ruin the open ending of the first book, bcs in the end not everyone would be happy with the continuation (cos some wld want tae to end up with jk whereas the rest wld rather him ending up with hyungsik--like me lol)