Those chicks are probly gonna get wet if they see how he is now.
There are reasons why it is both possible and improbable, but I think it is a possibility we have to keep in mind. I won't be surprised of I see Sosul using Soul Crushing Strike and other Black Origin techniques.
But Ketsurou say Shiwoon does do the wild thing with any or maybe all the girls, what would his motivation? Wouldn't he just do the wild thing until he gets tired of it, which being a teen would be a long, long while. Just let Shiwoon finish training and become #1 badass and then he can have as many women as he wants. I don't want him being distracted.
Well, I don't really think Shioon will become as wild as his master. His character is too different. But, he does need to realize what is going on around him. Shioon may be a genius when it comes to martial arts, but he's an idiot when it comes to women. He doesn't need to become obsessed with sex, he just needs to become more aware of the fact that he is desirable, and that there are people around him that very much do desire him. With his character, this wouldn't go to his head like it would Chun Woo. He would get all blushy and cute, and that would bring back a bit of comedy into the story.
Realizing that the women around him are romantically interested in him would not particularly distract him, it would just throw in another layer of depth to the plot. He has all of this going on in front of him, AND the women around him silently competing for him. It makes his life that much more complex.
It probably won't be until the end of part three, but Shioon seriously needs to...well, grow up. He's a man in pretty much every other way, especially as a warrior. He can't ignore romance forever. Not with the complexity his love life already has, even without him knowing.
Both Kaiser and Chun Woo wants to destroy Murim. Sunwoo clan was long opressed by MAA and enemy of Chundomoon (or what is it called), so it is only logical to empower Suwoo clan, which would then help destroy what is left of Murim. Sosul probably hates Murim people too. That's a lot of "Breakers".
And about girls, if Shioon chooses at least one of them, then there would be awkward situations with other girls. At this point, still, all of them are valid enough.. for readers to think about them, all four or more. And if Shioon would act on one of them... There would be less imagination from the readers. The only possible way is, if the needed amount of tension remains. And that is if Shioon keeps randomly spending "some" time with each of them, giving them care, and unconsciously not going any far with it.