Actually they will really try their f-ing best.
Oh its better for to you to read, for the excitement (and there some minor diffence between the webtoon and the novel). But they gonna know they can't do anything to get Jinwoo. Even using the info of his father or some corpse of a ss-rank monters. (I don't want to give spoiler but i think i still did, but thats that) (=・ω・=)
a ss-rank or an ss-rank. I think 'an' would be right. Yep its 'an ss-rank'. Sorry for rumbling.
Try if you can U.S.