Lot of people complaining about how mediocre this comic is, but honestly I don't mind it. Something about the sister is different to me. It's usually easy to predict what characters are gonna do in these manwha like go off on some stupid ten year journey or w/e like dumb horror movie protags...
At first mc had to help his sister get stronger but now it makes me laugh that she's so ridiculously 'strong'. It's like you can even tell the mc is jealous of his sister but not in a toxic way. Their commentary to each other is a lot more... I don't know, natural? Like they're actually close enough as siblings to be able to talk trash to each other, but they're still a good team.
Then again I'm fried from being up working for 48~+ hours so that could be it too.