I like the act that their relationship developed slowly and naturally. Also, the mangaka portrayed them as proper high school kids. They made things complicated bcs they're teenagers with insecurities but they comunicated to solve those problems. Even their smut scenes were not perfect since they were unexperienced, yet it also became better over the trials. Very healthy, dear and fluff story. (=・ω・=)
Everyone is so angry at cui xin but i like him. I think he is just so enthusiastic but he only likes the romance btw girls. He is not fetishizing or sexualizing the main couple in a creepy or perverted way. He is like a fanboy who is over the moon since his ship is canon. Also in the last chapter his words were very kind and righteous.
Heeseung we were all rooting for you ┗( T﹏T )┛