
My brother and I really love Solo Leveling. We've binge-read the light novel twice already and consider it one of the best action korean series. One of the main reasons is because of CHA HAEIN, the FL.
She is so freaking OP and adorable! The romance is not a main focus point in the series but it is done well regardless since it is a way for the MC to have some emotional development and showcase his humanity.
I honestly cannot understand why others want a harem or no romance at all in this series. Harems contain mostly one-dimensional female characters that used more like support and trophies to show the awesomeness of the MC; that's bullsh*t. I'd much rather have a godlike character that is sincere than an overpowered scum that "can't make up his mind".

Also I think its important to note that Jinwoo is human. But the system has forced and opened his eyes to situations where he has to get rid of emotions. Jinwoo was never an emotionless or cold person, he was just weak and felt detached from bonding with people. But The system is preparing him to become like that, detached. Haein is one of the reasons why he's somewhat more human and less of a vessal by the climax.
Tea be curing diseases now...