I feel you can say that for most relationship though? People get into relationships because they don't want to be lonely. Not saying that's a good or bad thing. But it's a common and normal feeling and motivation. Loneliness is a foundation for most relationships. Obviously, Subins feelings towards Hyung arent as strong as Hyungs feelings towards him....yet. However, it will be just as unequal if he gets into relationship with Hyunwoo-his unrequited love/obsession with Hyunwoo for the past years would be much greater than Hyunwoos feelings towards him at first.
I look at it this way: Subin had to decide who he could actually see himself with in an emotionally healthy, stable, committed relationship with the POTENTIAL to grow into actual real and lasting love. Which is what he's been looking for his whole life, and was denied by Hyunwoo for too long. Relationships take time to grow. And after seeing the difference between how Hyunwoo reacted to Subins absence (he wasn't acting normally and laughing and hanging out with Noona and her bf) with Hyungs reaction (hurt and longing) he is choosing Hyung because he sees the possibility of a real relationship to grow. He is tired of being the only one showing love and always being rejected. And I can understand his reasoning.
*he WAS acting normally
I agree with you I'm glad subin took a step forwards instead of repeating a loop
I ship Hyung x Subin but the situation doesn’t seem right for me. I feel like their relationship won’t be healthy? It feels too rushed. They could’ve spent more time realizing at proving that they really like each other. IDK. I just feel like they only need each other bec they’re both lonely specially Subin. But nevertheless I still ship them.