It's important to note what the author is doing here. Yohan said to his brother "why do this while getting nothing in return - what a useless spirit of self-sacrifice," so Yohan is here chosing not to tell Moogyeong so that he can stay with him while getting nothing in return.
The narrative set up all along, ladies, gents, and others, has come full circle. Well done Park Nodeok. *claps*
So is DG ugly compared to Alex, or is he hot and Alex is just being a twat?
Also, the Korean word they used for ugly could also mean airheaded, so maybe it's not certain which he meant.
He said “DG is ugly with bushy eyebrows” indicating that he is exaggerating here. Notice how he added the comment bushy eyebrows at the end where it isn’t really neccessary. He could’ve just said DG is ugly but he added with bushy eyebrows just to exagerate. Also th classmates of DG’s friends said DG looks like a model and he is handsome so yeah Alex is just being a twat hahaha
Very professional translation amigo.