There are definitely some people in this comment section that are either acting like psychologists or have never watched Asian dramas in their life. We have to keep in mind that this is an adaptation of a novel in which the author writes these characters from her own perception of people. She chose to write DJX as this beautiful, kind walking green-flag person and SZ was a little girl who admired her brother's friend for a long time to the point where she fell in love with him. I'm pretty sure the writer did not intend to make this a pedophilic, grooming type of relationship and it's pretty obvious from the novel that DJX does not start liking SZ until she goes to uni. People need to stop making their own conclusions because it's definitely not going to end up in a bad way. Whoever read the novel knows well how the ending goes and that's that. If you wanted to go watch a drama where the ML is realistic, there are plenty out there. Let everyone else enjoy the fluffiness of this one.