I wonder who is the person Seo Yul wants to take back with him when he leaves Songrim that he is making both Jang Uk and Mu Deok promise they will help him take.
So basically Master Lee's explanation for Jang Uk reaching Chisu so quickly is - He's just born special. I have no doubt that Jang Uk will try to reach Hwansu.
I think they will need to show that Seo Yul wins the fight in order for it to look credible. I can't imagine Jang Uk suddenly is now more powerful than Seo Yul.