The sister's death is a big mystery. She was allegedly assaulted by someone high-status, then forced to suicide, and the maid was killed. That's a solid "whodunit" hook. Wen Hao now has the chance to not only save her sister but also expose the culprit. I'm guessing it involves either Prince Jing's household or someone in the imperial family. Qi Shuo's involvement in the assassination at the start hints he's not a simple love interest but a key player.
Zhong Hao is the only one who reacted like a real martial artist. He is genuinely excited to find out there is someone stronger than he thought. The competitive fire is real. It is a shame he is stuck on the frontier fighting the Western Xia. It puts a temporary block on his story, but it builds hype for their eventual meeting. He is the rival I am looking forward to seeing interact with Peng Feng the most.