MQW

Hi chingu! Yes, I'm with you regarding the cast.... even the lady and the kid who live with HJ do a good job with their characters, lol.
I re-watched the scenes that are couple had together like 100 times and happened to notice that SW has talked the "informal" way to HJ *squeals*. The episode where this was more noticeably was 3 after the doctor was shot. Loved it!
So far, I've only heard him talking to JJ with the "yo"honorific as the end of the sentences.

You're not alone. It seems there are a couple of us who are rooting for Sun Woo and Hyun Jin relationship to deepen. I personally feel that it will in the upcoming episodes. I recently found and watched 2 intro videos of the drama and both showed a few scenes of them together. One scene will probably air on episode 7 or 8 after Hyun Jin gets kidnapped. Couldn't figure out if Hyun Jin will get thrown into the water or not. But, for sure, Sun Woo will rescue her and will be holding her arm to help her walk to the car. As for the other scene, I don't know when it will air, but Sun Woo will be waiting outside of an apartment or work building gate for Hyun Jin and will ask her if she wants to eat dinner together..... ????????????
I'm really hoping for these two to become a couple. Based on the 6 episodes that have aired, I can see that Sun Woo is drawn to Hyun Jin's smartness, braveness and kindness. I have also noticed that both of them get a lot of scenes together and she's sat next to him in his car more times than Jenny Jang and Ye Eun ????????????

I know right! And the way he looks at her is also different. Is as if he likes her, but can't say it. You should check this episode (https://www.youtube.com/watch?v=9b3zq--wlOg).... they both have 2 meaningful scenes. Their first scene starts at 20:57 and the second one at 31:00. I think the general conversation was about Xiao Yan's attitude changing ever since they arrived to that place.... I found both scenes sort of heartbreaking because you could see Xiao Yan tearing..

I have never been a fan a wuxia dramas. In fact, the only one that I've ever watched was Princess Agents and I sort of fast-forwarded thru the entire series. Fights Break Sphere, however, is so good that instead of fast-forwarding, I keep replaying the episodes... LOL...
This is my first time watching Wu Lei in a drama and judging from his performance in it, I can see why he's consider/known as China's "Nation Little Brother". His acting skills are superb and I can't get enough of him. Honestly, I don't want the drama to end with 45 episodes. They should prolong it.
As for the romance part, I'm rooting for Xiao Yan and Xun Er pairing. I think the director is pointing to this pairing's direction. On episode 12, we had the conversation between Xiao Yan & Yun Yun about Xun Er and Xiao Yan growing up together and being childhood sweethearts. Then on episode 13, when Xun Er and Xiao Yan had a conversation because of how he ended up been Xiao Yi Xian's husband, Xiao Yan kept on bringing up reasons for not getting married; 1) he said that his revenge was not over; 2) he brought up the 3-year agreement with Nalan Yan Ran; and 3) he said: "but the most important thing is...." (he just kept staring at Xun Er). When she asked what was the most important thing, he kept staring at her , but then shyly smiled/giggled and just told her that she needed to believe in him. My assumption is that his answer had something to do with her. Maybe, what he wanted to say is that the person he likes is her... What do you guys think?

I think she does. I just watched her battling with the guy from the soul clan. Here's the link to the video https://www.youtube.com/watch?v=nHXRpxx-Itk