Currently, there are 3 special episodes released by youku YouTube channel.

Episode 6

Word of Honor EP06 Special

Additional scene when both are cleaning the rabbits

Time code: 25:28

Episode 12

Word of Honor EP12 Special

WKX calls himself handsome

WKX calls ZZH 1 more time and ZZH reacts with shivering and talks back

Also ZZH calls WKX 2 more times

Time code: 21:35

Time code: 23:03

Time code: 23:53

Episode 17

Word of Honor EP17 Special

Long staring at each other

Time code: 39:35  

Episode 20 (not really a special, but still different from Chinese Version)

Word of Honor Episode 20

Longer hug and WKX put his arms around ZZH wraist

Time code: 7:28

Episode 20 added and also one more Time code for episode 12 special

 huntress1013:

I do wonder whether the ending that was aired as a special (episode 37) will eventually simply end up where it should - at the end of episode 36 in a special edition version. That would be cool. 

At viki it is a extra episode, youku didn't posted it yet on youtube (only a bit on the end of Episode 36 but not everything)