The martial arts are cool. The three leads especially are SO COOL. THE MOST COOL. They are all cool the whole damn time. Fan Duobing is the youngest and least experienced, but like both the others he is literally introduced kicking ass and taking names. Li Lianhua spends 99.9% of the drama at 10% of his strength and is essentially still untouchable. If he decides a fight is worth getting serious he never fails and it is AWESOME. Die Feisheng's default setting appears to be Badass Motherfucker.

the friendship is touching. The three leads especially but as you go through the series you slowly learn that there are other characters around who are deeply deeply loyal to the leads. Blind Liu is my favorite, he deserved more screen time.

The mysteries are fun. They may not make up a huge part of the series, but the process of who solves them and how gives you a lot of insight to various characters strengths, values, and methods. Plus it's really fun to watch the trio work together.

Li Xiangyi/Lianhua is the hero we don't deserve. Seriously, if someone needs saving the man saves them. If someone needs support he's right there when they need him. If he makes a promise he keeps it, even years and betrayals down the line. He talks a lot about his own flaws but he never acts on them. He cares so deeply about people and at every turn he does what he can to protect who he can.

I am in awe.