Why is the score so low?

7.4 isn't low , especially since MAL Scores are weighted ones , which means that the low number of members affect it a lot.
As for the reception , it's pretty good , even if the yaoi undertone turn off some peoples , or so i've heard.

Also , you have to take into account that it's a recent unpopular Manhwa (made by new and unpopular authors) , so don't expect it to be the same as Solo Leveling type of hype/score.